2.5×1.9×4=________×________×1.9
32×10.1=32×(________+________)=________×________+________×________.
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2.5 4 10 0.1 32 10 32 0.1
解析分析:2.5×1.9×4,运用乘法交换律和结合律进行简算;32×10.1,运用乘法分配律进行简算.
解答:2.5×1.9×4,=(2.5×4)×1.9,=10×1.9,=19;32×10.1,=32×(10+0.1),=32×10+32×0.1,=320+3.2,=323.2;故