1 1/2x5/7-(-5/7)x(-2 1/2) (-1/2)x5/7
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解决时间 2021-04-02 10:32
- 提问者网友：难遇难求
- 2021-04-01 12:51
1 1/2x5/7-(-5/7)x(-2 1/2) (-1/2)x5/7
最佳答案
- 五星知识达人网友：蓝房子
- 2021-04-01 14:12
1又1/2x5/7 - (-5/7)x(-2又1/2) + (-1/2)x5/7
= 1又1/2x5/7 - (5/7)x(2又1/2) - (1/2)x5/7
= (1又1/2 - 2又1/2 - 1/2) x 5/7
= - 1又1/2 x 5/7
= - 3/2 x 5/7
= -15/14
= -1又1/14
= 1又1/2x5/7 - (5/7)x(2又1/2) - (1/2)x5/7
= (1又1/2 - 2又1/2 - 1/2) x 5/7
= - 1又1/2 x 5/7
= - 3/2 x 5/7
= -15/14
= -1又1/14
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