求(1/2+1/4+1/6+1/8)×(1/4+1/6+1/8+1/10)-(1/2+1/4+1/6+1/8+1/10)×(1/4+1/6+1/8)等于几分之几?

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求(1/2+1/4+1/6+1/8)×(1/4+1/6+1/8+1/10)-(1/2+1/4+1/6+1/8+1/10)×(1/4+1/6+1/8)等于几分之几?求(1/2+1/4+1/6+1/8)×

求(1/2+1/4+1/6+1/8)×(1/4+1/6+1/8+1/10)-(1/2+1/4+1/6+1/8+1/10)×(1/4+1/6+1/8)等于几分之几?
求(1/2+1/4+1/6+1/8)×(1/4+1/6+1/8+1/10)-(1/2+1/4+1/6+1/8+1/10)×(1/4+1/6+1/8)等于几分之几?

求(1/2+1/4+1/6+1/8)×(1/4+1/6+1/8+1/10)-(1/2+1/4+1/6+1/8+1/10)×(1/4+1/6+1/8)等于几分之几?
20分之1
设1/4+1/6+1/8为x 所以原式是(1/2+x)×(x+1/10)-(1/2+x+1/10)×x=(x的平方+5分之3倍的x+20分之1)-(x的平方+5分之3倍的x)=20分之1