已知-X+2Y=6,则3(X-2Y)(X-2Y)-5(X-2Y)+6=( )
1个回答
-X+2Y=6
则:
X-2Y=-6
3(X-2Y)(X-2Y)-5(X-2Y)+6
=3×(-6)×(-6)-5×(-6)+6
=108+30+6
=144
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