Question

0.42×9.8+0.084的简便运算？

Answer 1

因吵拍为0.084=0.42×0.2，所以原式等野尺于0.42×9.8+0.42×0.2，运用乘法分配律逆运算有0.42×（9.8+0.2）升脊羡=4.2

Answer 2

0.42×9.8＋0.084
＝举埋0.42×9.8＋0.42×0.2
＝0.42×(9.8＋0.2)
…基胡…0.42×10
＝正锋蚂4.2

Answer 3

0.084等于0.42*0.2，然后就一起加起来等于0.42*10，得到答案4.2

Answer 4

原式可以看作0.42x(10-0.2)+0.084=4.2-0.42x0.2+0.084=4.2
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Answer 5

0.42Ⅹ9.8+0.084
=0.42X9.8十0.42X0.2
=0.42X(9.8十0.2)
=0.42X10
=4.2