4.09×7.5+0.25×40.9简便计算4.09×7.5+0.25×40.9?
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运用乘法分配律:
4.09×7.5+0.25×40.9
=4.09×7.5+2.5×4.09
=4.09×(7.5+2.5)
=4.09×10
=40.9
4.09×7.5+0.25×40.9
=4.09×7.5+2.5×4.09
=4.09×(7.5+2.5)
=4.09×10
=40.9
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