3.6×5.8+7.2×2.1简便方法
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3.6×5.8+7.2×2.1
=3.6×2×2.9+7.2×2.1
=7.2×2.9+7.2×2.1
=7.2×(2.9+2.1)
=7.2×5
=36
=3.6×2×2.9+7.2×2.1
=7.2×2.9+7.2×2.1
=7.2×(2.9+2.1)
=7.2×5
=36
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