1.80乘5目录
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1.85
*82
————
370
1480
————
151.70
即1.85*82=151.7
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180-80x4/5
=100 80-80x4/5
=100 80x(1-4/5)
=100 80x1/5
=100 16
=116
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1.84乘5.5 4.5乘1.84的简便算法
1.84乘5.5 4.5乘1.84
=1.84*(5.5 4.5)
=1.84*10
=18.4
1.80乘5目录
1.85
*82
————
370
1480
————
151.70
即1.85*82=151.7
180-80x4/5
=100 80-80x4/5
=100 80x(1-4/5)
=100 80x1/5
=100 16
=116
1.84乘5.5 4.5乘1.84的简便算法
1.84乘5.5 4.5乘1.84
=1.84*(5.5 4.5)
=1.84*10
=18.4
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