下面各题,你能用简便方法计算吗?1.0.76x9.9+0.076 2.11.72-(4.3x0.4+5.6) 3.12.
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下面各题,你能用简便方法计算吗?1.0.76x9.9+0.076 2.11.72-(4.3x0.4+5.6) 3.12.5x(8+0.8-0.047)
![下面各题,你能用简便方法计算吗?1.0.76x9.9+0.076 2.11.72-(4.3x0.4+5.6) 3.12.](/uploads/image/z/15229081-1-1.jpg?t=%E4%B8%8B%E9%9D%A2%E5%90%84%E9%A2%98%2C%E4%BD%A0%E8%83%BD%E7%94%A8%E7%AE%80%E4%BE%BF%E6%96%B9%E6%B3%95%E8%AE%A1%E7%AE%97%E5%90%97%3F1.0.76x9.9%2B0.076+2.11.72-%EF%BC%884.3x0.4%2B5.6%EF%BC%89+3.12.)
1.0.76x9.9+0.076
=0.076*99+0.076
=(99+1)*0.076
=100*0.076
=7.6
2.11.72-(4.3x0.4+5.6)
=10+1.72-1.72+5.6
=15.6
3.12.5x(8+0.8-0.047)
=12.5*8+12.5*0.8-12.5*0.04-12.5*0.007
=100+10-0.5-0.0875
=109.4125
=0.076*99+0.076
=(99+1)*0.076
=100*0.076
=7.6
2.11.72-(4.3x0.4+5.6)
=10+1.72-1.72+5.6
=15.6
3.12.5x(8+0.8-0.047)
=12.5*8+12.5*0.8-12.5*0.04-12.5*0.007
=100+10-0.5-0.0875
=109.4125
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