Question

72×0.8+1.8×8.4+0.1×84怎么简算？

Answer 1

72×0.8+1.8×8.4+0.1×84
=57.6+8.4x(1.8+1)
=57.6+8.4×2.8
=57.6+23.52
=81.12

Answer 2

72x0.8+1.8x8.4+0.1x84=72x0.8+0.18x84+0.1x84=72x0.8+84x（0.18+0.1）=72x0.8+84x0.28=57.6+23.52=81.12。先移动岩旦并迟烂并合并公粗迹因数。

Answer 3

你好，同学，前面这个是0.84，所以可以发现，前面中间扮告毁和后面都有一个84，所以我们可友瞎以把84提出来，这样子就是0.72，加上0.18，加上零厅备点1=1，所以最后的结果就是84×1=84

Answer 4

72*0.8+1.8*8.4+0.1*84
=72*0.8+1.8*8.4+1*8.4
=72*0.8+8.4*（1.8+1）汪兆枣困拆
=72*0.8+8.4*2.8
=12*6*0.8+12*0.7*2.8
=12*4.8+12*1.96
=12*（猜蔽4.8+1.96）
=81.12

追答

72*0.8+1.8*8.4+0.1*84=72*0.8+1.8*8.4+1*8.4=72*0.8+8.4*（1.8+1）=72*0.8+8.4*2.8=12*6*0.8+12*0.7*2.8=12*4.8+12*1.96=12*（4.8+1.96）=81.12

72*0.8+1.8*8.4+0.1*84=72*0.8+1.8*8.4+1*8.4=72*0.8+8.4*（1.8+1）=72*0.8+8.4*2.8=12*6*0.8+12*0.7*2.8=12*4.8+12*1.96=12*（4.8+1.96）=81.12

72*0.8+1.8*8.4+0.1*84=72*0.8+1.8*8.4+1*8.4=72*0.8+8.4*（1.8+1）=72*0.8+8.4*2.8=12*6*0.8+12*0.7*2.8=12*4.8+12*1.96=12*（4.8+1.96）=81.12

Answer 5

将芹首1.8*8.4改为嫌猜数7.2*2.1，72*0.8改为7.2*8
72*0.8+1.8*8.4+0.1*84
=7.2*8+7.2*2.1+8.4
=7.2*（兆档2.8+2.1）+8.4
=7.2*4.9+8.4
=7.2*（5-0.1）+8.4
=36-0.72+8.4
=35.28+8.4
=43.68