计算下列各题,能简便就简便.(用小学知识.一 42.9+31.1+2.04二 100-27.2-42.8三 1.8-1.57+0.2四 9-(4.02+1.25)五 72.8-8.9+8.86六 1.36+3.06-3.61

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计算下列各题,能简便就简便.(用小学知识.一 42.9+31.1+2.04二 100-27.2-42.8三 1.8-1.57+0.2四 9-(4.02+1.25)五 72.8-8.9+8.86六 1.36+3.06-3.61
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计算下列各题,能简便就简便.(用小学知识.一 42.9+31.1+2.04二 100-27.2-42.8三 1.8-1.57+0.2四 9-(4.02+1.25)五 72.8-8.9+8.86六 1.36+3.06-3.61
计算下列各题,能简便就简便.(用小学知识.
一 42.9+31.1+2.04
二 100-27.2-42.8
三 1.8-1.57+0.2
四 9-(4.02+1.25)
五 72.8-8.9+8.86
六 1.36+3.06-3.61

计算下列各题,能简便就简便.(用小学知识.一 42.9+31.1+2.04二 100-27.2-42.8三 1.8-1.57+0.2四 9-(4.02+1.25)五 72.8-8.9+8.86六 1.36+3.06-3.61
42.9+31.1+2.04 100-27.2-42.8 1.8-1.57+0.2
=74+2.04 =100-(27.2+42.8) =1.8+0.2-1.57
=76.04 =100-70 =2-1.57
=30 =0.43
9-(4.02+1.25) 72.8-8.9+8.86 1.36+3.06-3.61
=9-5.27 =72.8+8.86-8.9 =4.42-3.61
=3.73 =30.66-8.9 =0.81
=21.76

1. 42.9+31.1+2.04
=75+2.04
+77.04
2.100-27.2-42.8
=100-(27.2+42.8)
=100-70
=30
3.1.8-1.57+0.2
=1.8+0.2-1.57
=2-1.57
=0.43
4. 9-(4.02+1.25)
=9-5.27
=3.73
5. 72.8-8.9+8.86
=63.9+8.86
=72.76
6. 1.36+3.06-3.61
=4.42-3.61
=0.81

一 (42.9+32.2)+2.04
=75+2.04
=77.04
二 100-(27.2+42.8)
=100-70
=30
三 1.8+0.2-1.57
=2-1.57
=0.43 <...

全部展开

一 (42.9+32.2)+2.04
=75+2.04
=77.04
二 100-(27.2+42.8)
=100-70
=30
三 1.8+0.2-1.57
=2-1.57
=0.43
五 72.8-(8.9-8.86)
=72.8-0.04
=72.76
六 1.36+3.06-3.61
=4.42-3.61
=0.81

收起

一 原式=(42.9+32.2)+2.04
=75+2.04
=77.04
二 原式=100-(27.2+42.8)
=100-70
=30
三 原式=1.8+0.2-1.57
=2-1.57
...

全部展开

一 原式=(42.9+32.2)+2.04
=75+2.04
=77.04
二 原式=100-(27.2+42.8)
=100-70
=30
三 原式=1.8+0.2-1.57
=2-1.57
=0.43
四 原式=9-5.27
=3.73
五 原式=72.8-(8.9-8.86)
=72.8-0.04
=72.76
六 原式=4.42-3.61
=0. 81

收起