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](/uploads/image/z/8454993-33-3.jpg?t=%E8%AE%A1%E7%AE%97%E4%B8%8B%E5%88%97%E5%90%84%E9%A2%98%2C%E8%83%BD%E7%AE%80%E4%BE%BF%E5%B0%B1%E7%AE%80%E4%BE%BF.%EF%BC%88%E7%94%A8%E5%B0%8F%E5%AD%A6%E7%9F%A5%E8%AF%86.%E4%B8%80+42.9%2B31.1%2B2.04%E4%BA%8C+100-27.2-42.8%E4%B8%89+1.8-1.57%2B0.2%E5%9B%9B+9-%EF%BC%884.02%2B1.25%EF%BC%89%E4%BA%94+72.8-8.9%2B8.86%E5%85%AD+1.36%2B3.06-3.61)
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
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