用特殊方法算(1+0.45+0.56)*(0.45+0.56+0.67)-(1+0.45+0.56+0.67*(0.45+0.56)=?

问题描述:

用特殊方法算(1+0.45+0.56)*(0.45+0.56+0.67)-(1+0.45+0.56+0.67*(0.45+0.56)=?

设0.45+0.56=A,0.45+0.56+0.67=B
则原式=(1+A)×(B)-(1+B)×(A)
=B+AB-A-AB=B-A
=0.67