Question

72×0.8+1.8×8.4+0.1×84怎么简算？

Answer 1

原式=72×0.8 + 1.8×8.4 + 8.4
=72×0.8 + 8.4×(1.8 + 1)
=72×0.8 + 8.4×2.8
=72×0.8 + 8.4×(2 + 0.8)
=57.6 + 8.4×2 + 8.4×0.8
=57.6 + 16.8 + 6.72
=81.12

Answer 2

你好，同学，前面这个是0.84，所以可以发现，前面中间和后面都有一个84，所以我们可以把84提出来，这样子就是0.72，加上0.18，加上零点1=1，所以最后的结果就是84×1=84

Answer 3

将1.8*8.4改为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*（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

Answer 4

72×0.8+1.8×8.4+0.1×84
=72×0.8+1.8×8.4+0.1×10×8.4
=72×0.8+8.4×（1.8+0.1×10）
=72×0.8+8.4×2.8
=72×0.8+8.4×（2+0.8）
=72×0.8+8.4×2+0.4×0.8
=0.8×（72+0.4）+8.4×2
=0.8×72.4+16.8
=57.92+16.8
=74.72

Answer 5

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

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