计算 (x+2y)(x-2y)+(x+1)和x(x-1)-(x-31)(x+31)
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计算(x+2y)(x-2y)+(x+1)和x(x-1)-(x-31)(x+31)计算(x+2y)(x-2y)+(x+1)和x(x-1)-(x-31)(x+31)计算(x+2y)(x-2y)+(x+1)
计算 (x+2y)(x-2y)+(x+1)和x(x-1)-(x-31)(x+31)
计算 (x+2y)(x-2y)+(x+1)和x(x-1)-(x-31)(x+31)
计算 (x+2y)(x-2y)+(x+1)和x(x-1)-(x-31)(x+31)
(x+2y)(x-2y)+(x+1)
=x^2-4y^2+x+1
x(x-1)-(x-31)(x+31)
=x^2-x-(x^2-961)
=x^2-x-x^2+961
=961-x
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