x-2y+3=0 求x^2-(4y+1)x+4y^2+8y
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x-2y+3=0求x^2-(4y+1)x+4y^2+8yx-2y+3=0求x^2-(4y+1)x+4y^2+8yx-2y+3=0求x^2-(4y+1)x+4y^2+8yx-2y=-3式子写错了原式=x
x-2y+3=0 求x^2-(4y+1)x+4y^2+8y
x-2y+3=0 求x^2-(4y+1)x+4y^2+8y
x-2y+3=0 求x^2-(4y+1)x+4y^2+8y
x-2y=-3
式子写错了
原式=x²-4xy-4x+4y²+8y
=(x-2y)²-4(x-2y)
=9+12
=21
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