8889
1
=
89
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88
2
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88
8
−
9
3
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(
8
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8
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8
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9
4
=
88
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5
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89
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⋅
8
6
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98
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8
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8
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9
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8
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8
8
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88
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9
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8
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98
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88
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8
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8
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13
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8
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8
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8
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88
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8
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8
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9
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88
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89
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8
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8
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88
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8
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8
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23
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8
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88
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25
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89
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8
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8
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28
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88
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8
29
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8
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31
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32
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88
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98
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39
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88
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41
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8
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8
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43
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44
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88
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45
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98
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51
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52
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88
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58
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59
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61
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63
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88
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67
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69
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88
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88
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75
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79
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80
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89
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98
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83
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88
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85
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89
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8
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86
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88
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87
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9
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89
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88
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90
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8
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91
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8
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92
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93
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9
94
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98
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8
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96
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98
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8
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8
97
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98
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8
8
98
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98
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8
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8
99
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88
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100
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98