7.8×5.6+2.3×4.4用简便方法怎么做

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7.8×5.6+2.3×4.4用简便方法怎么做
7.8×5.6+2.3×4.4用简便方法怎么做

7.8×5.6+2.3×4.4用简便方法怎么做
7.8×5.6+2.3×4.4
=7.8×5.6+2.3×(10-5.6)
=7.8×5.6+2.3×10-2.3×5.6
=(7.8-2.3)×5.6+23
=5.5×5.6+23
=(5+0.5)×5.6+23
=5×5.6+0.5×5.6+23
=28+2.8+23
=53.8

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