(12+27+34)*(27+34+56)-(12+27+34+56)*(27+34)简便计算

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(12+27+34)*(27+34+56)-(12+27+34+56)*(27+34)简便计算
(12+27+34)*(27+34+56)-(12+27+34+56)*(27+34)
简便计算

(12+27+34)*(27+34+56)-(12+27+34+56)*(27+34)简便计算
把27=+34 提出来~!

(12+27+34)*(27+34+56)-(12+27+34+56)*(27+34)
令A=(12+27+34),B=27+34
则原式=A*(B+56)-(A+56)*B=(A-B)*56=12*56=272

x=27+34
y =12
z=56
(y+x)*(x+z)-(x+y+z)*(x)
=y*z
=12*56
=672