Question

用简便方法计算下列各题 0.25x16.2x4 4.8x7.8+78

用简便方法计算下列各题
0.25x16.2x4 4.8x7.8+78x0.52 3.72x3.5+6.28x3.5 36.8-3.9-6.1 25.48-（9.4-0.52）

Answer 1

0.25x16.2x4
=0.25×4×16.2
=1×16.2
=16.2
4.8x7.8+78x0.52
=4.8×7.8+7.8×5.2
=7.8×（4.8+5.2）
=7.8×10
=78
3.72x3.5+6.28x3.5
=3.5×（3.72+6.28）
=3.5×10
=35
36.8-3.9-6.1
=36.8-（3.9+6.1）
=36.8-10
=26.8
25.48-（9.4-0.52）
=25.48+0.52-9.4
=26-9.4
=17.6

Answer 2

3.7x2.5+0.3x2.5=（3.7 +0.3）X2.5=4X2.5=10 0.125x（8+0.8）=0.125X8+0.125X0.8=1+0.1=1.1 1.6x7.8x1.25=7.8X2X0.8X1.25=7.8X2X1=15.6 解方程 4（x-6）=36 4x-24=36 4x=36+24 x=60/4 x=15 2x+0.2xx2=36 2x+0.4x=36 2.4x=36 x=36/2.4 x=15 根据...

Answer 3

来几题吧 29+52+48 698-275-25 48×37+52×37 79×68-79×58 88×125 99×87 101×56 （40+4）×25