2.8×5.6+7.2×5.64的简便计算？
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2.8x5.6+7.2x5.64
=2.8x(5.64-0.04)+7.2x5.64
=2.8x5.64-2.8x0.04+7.2x5.64
=(2.8+7.2)x5.64-2.8x0.04
=10x5.64-0.112
=56.4-0.112
=56.288
=2.8x(5.64-0.04)+7.2x5.64
=2.8x5.64-2.8x0.04+7.2x5.64
=(2.8+7.2)x5.64-2.8x0.04
=10x5.64-0.112
=56.4-0.112
=56.288
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