7.8x5.6+2.3x4.4的简便算法
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7.8x5.6+2.3x4.4
=（5.5+2.3）x5.6+2.3x4.4
=5.5x5.6+2.3x5.6+2.3x4.4
=5.5x5.6+2.3x（5.6+4.4）
=5x5.6+0.5x5.6+23
=28+2.8+23
=53.8
=（5.5+2.3）x5.6+2.3x4.4
=5.5x5.6+2.3x5.6+2.3x4.4
=5.5x5.6+2.3x（5.6+4.4）
=5x5.6+0.5x5.6+23
=28+2.8+23
=53.8
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