已知:-x+2y-6=0,则3(x-2y)^2-5(x-2y)+6=

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已知:-x+2y-6=0,则3(x-2y)^2-5(x-2y)+6=已知:-x+2y-6=0,则3(x-2y)^2-5(x-2y)+6=已知:-x+2y-6=0,则3(x-2y)^2-5(x-2y)+

已知:-x+2y-6=0,则3(x-2y)^2-5(x-2y)+6=
已知:-x+2y-6=0,则3(x-2y)^2-5(x-2y)+6=

已知:-x+2y-6=0,则3(x-2y)^2-5(x-2y)+6=
-x+2y-6=0
所以x-2y=-6
原式=3×(-6)²-5×(-6)+6
=108+30+6
=144

下除以n
=[(n³+n)/n^4]^1/4/(1+6/n)
=(1/n+1/n³)^1/4/(1+6/n)
n→∞
则n在分母的项都→0
所以极限=(0+0)/(1+0)=0