(3x-y)^2+(3x+y)(3x-y),x=1,y=-2
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(3x-y)^2+(3x+y)(3x-y),x=1,y=-2(3x-y)^2+(3x+y)(3x-y),x=1,y=-2(3x-y)^2+(3x+y)(3x-y),x=1,y=-21041012290
(3x-y)^2+(3x+y)(3x-y),x=1,y=-2
(3x-y)^2+(3x+y)(3x-y),x=1,y=-2
(3x-y)^2+(3x+y)(3x-y),x=1,y=-2
1041012290364
原式=9x²-6xy+y²+9x²-y²
=18x²-6xy
=18*1²-6*1*(-2)
=18+12
=30
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