5.6X3.2-2.4x3.8能简便就简便。
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5.6×3.2-2.4×3.8
=5.6×3.2-2.4×(3.2+0.4)
=5.6×3.2-2.4×3.2-2.4×0.4
=3.2×(5.6-2.4)-0.96
=3.2×3.2-3.2×0.3
=3.2×(3.2-0.3)
=3.2×2.9
=9.28
=5.6×3.2-2.4×(3.2+0.4)
=5.6×3.2-2.4×3.2-2.4×0.4
=3.2×(5.6-2.4)-0.96
=3.2×3.2-3.2×0.3
=3.2×(3.2-0.3)
=3.2×2.9
=9.28
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