简便计算57点6乘1点6+28点8乘36点8-14点4乘80
1个回答
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原式
=57.6x1.6+28.8x36.8-14.4x80
=14.4x4x1.6+14.4x2x36.8-14.4x80
=14.4x6.4+14.4x73.6-14.4x80
=14.4x(6.4+73.6-80)
=14.4x(80-80)
=14.4x0
=0
或者：
=57.6x1.6+28.8x2x18.4-14.4x4x20
=57.6x1.6+57.6x18.4-57.6x20
=57.6x(1.6+18.4-20)
=57.6x(20-20)
=57.6x0
=0
=57.6x1.6+28.8x36.8-14.4x80
=14.4x4x1.6+14.4x2x36.8-14.4x80
=14.4x6.4+14.4x73.6-14.4x80
=14.4x(6.4+73.6-80)
=14.4x(80-80)
=14.4x0
=0
或者：
=57.6x1.6+28.8x2x18.4-14.4x4x20
=57.6x1.6+57.6x18.4-57.6x20
=57.6x(1.6+18.4-20)
=57.6x(20-20)
=57.6x0
=0
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