45.6*6.7+4.56*31+0.46*20的简便运算
1个回答
45.6*6.7+4.56*31+0.456*20
=45.6*6.7+45.6*3.1+45.6*0.2
=45.6*（6.7+3.1+0.2）
=45.6*10
=456
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