简便运算:12.5*(8-0.8).2.7*4.3+5.7*2.7.0..77*99.6.18*9.9+0.618.0.
来源:学生作业帮 编辑:神马作文网作业帮 分类:数学作业 时间:2024/11/13 18:02:34
简便运算:12.5*(8-0.8).2.7*4.3+5.7*2.7.0..77*99.6.18*9.9+0.618.0.25*1.25*0.8*40
12.5*(8-0.8)
=12.5*8-12.5*0.8
=100-10
=90
2.7*4.3+5.7*2.7
=2.7*(4.3+5.7)
=2.7*10
=27
0.77*99
=0.77*100-0.77
=77-0.77
=76.23
6.18*9.9+0.618
=0.618*99+0.618
=0.618*(99+1)
=0.618*100
=61.8
0.25*1.25*0.8*40
=(0.25*40)*(1.25*0.8)
=10*1
=10
=12.5*8-12.5*0.8
=100-10
=90
2.7*4.3+5.7*2.7
=2.7*(4.3+5.7)
=2.7*10
=27
0.77*99
=0.77*100-0.77
=77-0.77
=76.23
6.18*9.9+0.618
=0.618*99+0.618
=0.618*(99+1)
=0.618*100
=61.8
0.25*1.25*0.8*40
=(0.25*40)*(1.25*0.8)
=10*1
=10
简便运算:12.5*(8-0.8).2.7*4.3+5.7*2.7.0..77*99.6.18*9.9+0.618.0.
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