(1+0.23+0.34)*(0.23+0.34+0.65)-(1+0.23+0.34+0.65)*(0.23+0.34的简便算是多少

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(1+0.23+0.34)*(0.23+0.34+0.65)-(1+0.23+0.34+0.65)*(0.23+0.34的简便算是多少
(1+0.23+0.34)*(0.23+0.34+0.65)-(1+0.23+0.34+0.65)*(0.23+0.34的简便算是多少

(1+0.23+0.34)*(0.23+0.34+0.65)-(1+0.23+0.34+0.65)*(0.23+0.34的简便算是多少
令a=0.23+0.34
所以原式=(1+a)(a+0.65)-(1+a+0.65)a
=(1+a)a+0.65(1+a)-(1+a)a-0.65a
=0.65(1+a)-0.65a
=0.65+0.65a-0.65a
=0.65