简便运算 (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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简便运算(1+0.12+0.23)x(0.12+0.23+0.34)-(1+0.12+0.23+0.34)x(0.12+0.23)简便运算(1+0.12+0.23)x(0.12+0.23+0.34)-

简便运算 (1+0.12+0.23)x(0.12+0.23+0.34)-(1+0.12+0.23+0.34)x(0.12+0.23)
简便运算 (1+0.12+0.23)x(0.12+0.23+0.34)-(1+0.12+0.23+0.34)x(0.12+0.23)

简便运算 (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)=(0.12+0.34+0.34)+(0.12+0.23)x(0.12+0.23+0.34-1-0.12-0.23-0.34)=(0.12+0.23+0.34)-(0.12+0.23)=0.34

设0.12+0.23=x
0.12+0.23+0.34=y
(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+x)y-(1+y)x
=y+xy-x-xy
=y-x
=0.34

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