7.8x5.6+2.3x4.4的简便算法
3个回答
2012-12-17
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7.8×5.6+2.3×4.4.
=(5.6+4.4)×(7.8+2.2)+(5.6+4.4)×0.1
=100+1
=101
=(5.6+4.4)×(7.8+2.2)+(5.6+4.4)×0.1
=100+1
=101
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展开全部
7.8x5.6+2.3x4.4
=7.8x(10-4.4)+2.3x4.4
=7.8*10-7.8*4.4+2.3*4.4
=78-4.4*(7.8-2.3)
=78-4.4*5.5
=78-4*1.1*5*1.1
=78-20*1.21
=78-24.2
=53.8
=7.8x(10-4.4)+2.3x4.4
=7.8*10-7.8*4.4+2.3*4.4
=78-4.4*(7.8-2.3)
=78-4.4*5.5
=78-4*1.1*5*1.1
=78-20*1.21
=78-24.2
=53.8
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