9.99×22.2+33.3×3.34有简便方法吗
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9.99×22.2+33.3×3.34有简便方法吗
9.99×22.2+33.3×3.34有简便方法吗
9.99×22.2+33.3×3.34有简便方法吗
9.99*22.2+33.3*3.34
=(3.33*3)*22.2+(3.33*10)*3.34
=3.33*(3*22.2)+3.33*(10*3.34)
=3.33*66.6+3.33*33.4
=3.33*(66.6+33.4)
=3.33*100
=333
以上式子里面的星号*是指乘号×