乘法分配律练习题

1) 计算下列表达式:
a) 2 * (3 + 4)
解:
2 * (3 + 4) = 2 * 7 = 14
b) (5 - 3) * 4
解:
(5 - 3) * 4 = 2 * 4 = 8
c) 6 * (2 + 3)
解:
6 * (2 + 3) = 6 * 5 = 30
d) (9 - 6) * 7
解:
(9 - 6) * 7 = 3 * 7 = 21
2) 将乘法分配律应用到下列表达式中:
a) 3 * (4 + 5)
解:
根据乘法分配律, 3 * (4 + 5) = (3 * 4) + (3 * 5) = 12 + 15 = 27
b) (6 - 2) * 8
解:
根据乘法分配律, (6 - 2) * 8 = (6 * 8) - (2 * 8) = 48 - 16 = 32
c) 7 * (9 + 2)
解:
根据乘法分配律, 7 * (9 + 2) = (7 * 9) + (7 * 2) = 63 + 14 = 77
d) (10 - 3) * 6
解:
根据乘法分配律, (10 - 3) * 6 = (10 * 6) - (3 * 6) = 60 - 18 = 42