计算下面各题,能简算的要简算.①3.5×102 ...
答案:1 悬赏:70 手机版
解决时间 2021-11-22 13:12
- 提问者网友:伴风望海
- 2021-11-22 05:10
计算下面各题,能简算的要简算.①3.5×102 ...
最佳答案
- 五星知识达人网友:酒醒三更
- 2021-11-22 05:20
①3.5×102
=3.5×(100+2)
=3.5×100+3.5×2
=350+7
=357
②4.28-1.39-2.61
=4.28-(1.39+2.61)
=4.28-4
=0.28
③7.2×0.3+0.3×0.8
=0.3×(7.2+0.8)
=0.3×8
=2.4
④0.4×3.14×2.5
=0.4×2.5×3.14
=1×3.14
=3.14
⑤840÷(0.23+0.37)÷7
=840÷0.6÷7
=840÷(0.6×7)
=840÷4.2
=200
=3.5×(100+2)
=3.5×100+3.5×2
=350+7
=357
②4.28-1.39-2.61
=4.28-(1.39+2.61)
=4.28-4
=0.28
③7.2×0.3+0.3×0.8
=0.3×(7.2+0.8)
=0.3×8
=2.4
④0.4×3.14×2.5
=0.4×2.5×3.14
=1×3.14
=3.14
⑤840÷(0.23+0.37)÷7
=840÷0.6÷7
=840÷(0.6×7)
=840÷4.2
=200
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