简便运算 1.25×6.4 0.25×3.2
答案:1 悬赏:80 手机版
解决时间 2021-03-27 19:56
- 提问者网友：星軌
- 2021-03-27 02:17
简便运算 1.25×6.4 0.25×3.2
最佳答案
- 五星知识达人网友：醉吻情书
- 2021-03-27 03:48
1.25x6.4
=1.25x8x0.8
=10x0.8
=8追答0.25x3.2
=0.25x4x0.8
=1x0.8
=0.8追问简便运算
2.9×0.45+0.29×4.2+0.029×13
3.84×9.6+0.96×61.6追答2.9x0.45+0.29x4.2+0.029x13
=2.9x0.45+2.9x0.42+2.9x0.13
=2.9x（0.45+0.42+0.13）
=2.9x1
=2.93.84x9.6+0.96x61.6
=3.84x9.6+9.6x6.16
=9.6x（3.84+6.16）
=9.6x10
=96
=1.25x8x0.8
=10x0.8
=8追答0.25x3.2
=0.25x4x0.8
=1x0.8
=0.8追问简便运算
2.9×0.45+0.29×4.2+0.029×13
3.84×9.6+0.96×61.6追答2.9x0.45+0.29x4.2+0.029x13
=2.9x0.45+2.9x0.42+2.9x0.13
=2.9x（0.45+0.42+0.13）
=2.9x1
=2.93.84x9.6+0.96x61.6
=3.84x9.6+9.6x6.16
=9.6x（3.84+6.16）
=9.6x10
=96
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