7.8x5.6+2.3x4.4要简便算法,怎么算
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7.8x5.6+2.3x4.4
=(8-0.2)*(6-0.4)+(2+0.3)*(4+0.4)
=48-1.2-3.2-0.08+8+1.2+0.8+0.12
=53.8
=(8-0.2)*(6-0.4)+(2+0.3)*(4+0.4)
=48-1.2-3.2-0.08+8+1.2+0.8+0.12
=53.8
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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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