9.9*31.5+3.3*5.5简便方法?
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=(3.3x3)x31.5+3.3x5.5
=3.3x(3x31.5)+3.3x5.5
=3.3x94.5+3.3x5.5
=3.3x(94.5+5.5)
=3.3x100
=330
=3.3x(3x31.5)+3.3x5.5
=3.3x94.5+3.3x5.5
=3.3x(94.5+5.5)
=3.3x100
=330
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展开全部
9.9×31.5+3.3×5.5
=3.3×94.5+3.3×5.5
=(94.5+5.5)×3.3
=100×3.3
=330
=3.3×94.5+3.3×5.5
=(94.5+5.5)×3.3
=100×3.3
=330
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展开全部
9.9×31.5+3.3×5.5
=3.3×3×31.5+3.3×5.5
=3.3×94.5+3.3×5.5
=3.3×(94.5+5.5)
=3.3×100
=330
=3.3×3×31.5+3.3×5.5
=3.3×94.5+3.3×5.5
=3.3×(94.5+5.5)
=3.3×100
=330
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