Question

43.2✘9.8+8.64怎么简便运算？

Answer 1

简便计算方法如下：
43.2×9.8+8.64
=8.64×5×9.8+8.64
=8.64×(5×9.8+1)
=8.64×(49+1)
=8.64×50
=432

Answer 2

方法1：把8.64=43.2X0.2，也就是原式=43.2X9.8+43.2X0.2=43.2X（9.8+0.2）=43.2X10=432
方法2：把9.8拆解为9.8=10-0.2，也就是原式=43.2X（10-0.2）+8.64=432-8.64+8.64=432

Answer 3

43.2＝4.32乘以10，8.64＝4.32乘以2，9.8乘以10＝98，这几个没问题吧，所以是4.32乘以98+4.32乘以2＝4.32乘以（98+2）＝4.32乘以100

Answer 4

43.2×9.8+8.64
＝4.32×（100-2）+4.32×2
＝4.32×（100-2+2）
＝4.32×100
＝432

Answer 5

43.2×9.8+8.64
=43.2×(10-0.2)+8.64
=43.2×10-43.2×0.2+8.64
=432-8.64+8.64
=432

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