(1+0.12+0.23)X(0.12+0.23+0.34)-(1+0.12+0.23+0.34)X(0.12+0.23)=?

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(1+0.12+0.23)X(0.12+0.23+0.34)-(1+0.12+0.23+0.34)X(0.12+0.23)=?
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(1+0.12+0.23)X(0.12+0.23+0.34)-(1+0.12+0.23+0.34)X(0.12+0.23)=?
(1+0.12+0.23)X(0.12+0.23+0.34)-(1+0.12+0.23+0.34)X(0.12+0.23)=?

(1+0.12+0.23)X(0.12+0.23+0.34)-(1+0.12+0.23+0.34)X(0.12+0.23)=?
令0.12+0.23+0.34=a 则0.14+0.23=a-0.32 原式=(1+a)× a -(1+a)×(a-0.32) =(a + a的平方)-(a - 0.32 + a的平方 - 0.32a) =0.32×(1+a) =0.32×(1+0.12+0.23+0.34) =0.32×1.69 -0.5408