43.9×2.7 4.39×72用乘法分配律怎么解
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43.9×2.7+4.39×72
= 43.9×2.7+43.9×7.2
=43.9×(2.7+7.2)
=43.9×9.9
=43.9×(10-0.1)
=43.9×10-43.9×0.1
=439-4.39
=434.61
= 43.9×2.7+43.9×7.2
=43.9×(2.7+7.2)
=43.9×9.9
=43.9×(10-0.1)
=43.9×10-43.9×0.1
=439-4.39
=434.61
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