0.79*0.79*99怎么简便运算
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0.79*0.79*99怎么简便运算
0.79*0.79*99怎么简便运算
0.79*0.79*99怎么简便运算
0.79×0.79×99
=(0.8-0.01)(0.8-0.01)(100-1)
=(0.8-0.01)²(100-1)
=(0.64-0.016+0.0001)(100-1)
=0.6241*100-0.6241*1
=62.41-0.6241
=61.7859
0.79*0.79*99
=0.79*0.79*(100-1)
=79*0.79-0.79*0.79
=79*(0.8-0.01)-0.79*(0.8-0.01)
=63.2 -0.79-0.632+0.0079
=61.7859
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0.79*0.79*99
=(0.8-0.01)*(0.8-0.01)*(100-1)
=(0.64-0.016+0.0001)*(100-1)
=64-1.6+0.01-0.64+0.016-0.0001
=61.7539
0.79+0.79*99
=(99+1)*0.79
=100*0.79
=79