数学求助！！要详细过程
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1. 2A - 7B = 8 ------(1)
3A - 8B = 10 ------(2)
(1) x3 - (2) x 2 -5B = 4, B = -4/5
A = (8 + 7B)/2 = 6/5
2. 1003 x 997 = (1000+3) *(1000-3)
= 1000000 - 9
= 999991
3. (14 + 2/3) x (15 + 1/3) = (15 -1/3) x (15 + 1/3)
= 225 - 1/9
= 224 又 8/9
3A - 8B = 10 ------(2)
(1) x3 - (2) x 2 -5B = 4, B = -4/5
A = (8 + 7B)/2 = 6/5
2. 1003 x 997 = (1000+3) *(1000-3)
= 1000000 - 9
= 999991
3. (14 + 2/3) x (15 + 1/3) = (15 -1/3) x (15 + 1/3)
= 225 - 1/9
= 224 又 8/9
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