13.9+7.2-1.67+12.8用简便方法计算
13.9+7.2-1.67+12.8用简便方法计算
13.9+7.2-1.67+12.8
=(13.9-1.67)+(7.2+12.8)
=12.23+20
=32.23
3.67+7.2-1.67+12.8用简便方法计算
3.67+7.2-1.67+12.8
=(3.67-1.67)+(7.2+12.8)
=2+20
=22
12.8十5.9十7.2用简便方法计算
12.8十5.9十7.2
=(12.8+7.2)+5.9
=20+5.9
=25.9
13.9+7.2-1.67+12.8为什么等于32.3
∵13.9+7.2-1.67+12.8
=7.2+12.8+13.9-1.67
=20+13.9-1.67
=33.9-1.67
=32.23
∴13.9+7.2-1.67+12.8等于32.23
13.9+139×9.9用简便方法计算
=139×0.1+139×9.9
=139×(0.1+9.9)
=139×10
=1390
希望我的回答能够帮到你,如有问题继续追问。
用简便方法计算3.7*12.8 3.6*7.4
3.7*12.8+3.6*7.4
=3.7*2*6.4+3.6*7.4
=7.4*6.4+7.4*3.6
=7.4*(6.4+3.6)
=7.4*10
=74
【12.8+12.8+12.8+12.8】×2.5用简便方法计算 怎么做
[12.8+12.8+12.8+12.8]×2.5
=12.8x4x2.5
=12.8x(4x2.5)
=12.8x10
=128
135×1.67+13.5×3.3 用简便方法计算
135×1.67+13.5×3.3
=135×1.67+135×0.33
=135×(1.67+0.33)
=135×2
=270
36.7×13.5-135×1.67用简便方法计算
36.7×13.5-135×1.67
=3.67×135-135×1.67
=135x(3.67-1.67)
=135x2
=270
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