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

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