4.7×7.8+0.47×22 求怎么巧算
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4.7×7.8+0.47×22 求怎么巧算
4.7×7.8+0.47×22 求怎么巧算
4.7×7.8+0.47×22 求怎么巧算
4.7x7.8+0.47x10x2.2
=4.7x7.8+4.7x2.2
=4.7x(7.8+2.2)
=4.7x10
=47
4.7×7.8+0.47×22 求怎么巧算
4.7×7.8+0.47×22 求怎么巧算
4.7×7.8+0.47×22 求怎么巧算
4.7x7.8+0.47x10x2.2
=4.7x7.8+4.7x2.2
=4.7x(7.8+2.2)
=4.7x10
=47