这两道计算题,答案我有,求方法!!或者巧算方法!谢谢谢谢!!
1个回答
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(1)原式=[(7/5)×(5/2) -1] ÷9×(3/4)平方 - | 2 + (-1/8)×25 |
=(册如7/2 - 1)×(1/9)×(9/16) - | 2- 25/8 |
=(5/2)×(1/16) - 9/尺枣8
=5/32 - 36/32
=-31/32
(2) 原式=-(27/陵姿拆2)×(5/4 - 35/12)÷(-1/2)×(4/3)×(4/3) - (4/3)×(4-4)
=(27/2)×(15/12 - 35/12)×2×(16/9) - 0
=3×(-5/3)×16
=-5×16
=-80
=(册如7/2 - 1)×(1/9)×(9/16) - | 2- 25/8 |
=(5/2)×(1/16) - 9/尺枣8
=5/32 - 36/32
=-31/32
(2) 原式=-(27/陵姿拆2)×(5/4 - 35/12)÷(-1/2)×(4/3)×(4/3) - (4/3)×(4-4)
=(27/2)×(15/12 - 35/12)×2×(16/9) - 0
=3×(-5/3)×16
=-5×16
=-80
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