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(1) -3X^-2XY-8XY-(-5Y^2)-2X^2-Y^2(2) 3(-2+3X-X^2)-(4-3X+X^2)
题目内容:
(1) -3X^-2XY-8XY-(-5Y^2)-2X^2-Y^2
(2) 3(-2+3X-X^2)-(4-3X+X^2)
(3) 3X^2-{5X-2(2X-3)}
(4) (2X^2-1/2+3x)-4(X-X^2+1/2)
要具体过程、不要错误答案、这里没有乘法、只有加减、^2代表2的平方、麻烦速度、谢谢优质解答
(1) -3X^-2XY-8XY-(-5Y^2)-2X^2-Y^2
=-3x^2-2xy-8xy+5y^2-2x^2-y^2
=-5x^2-10xy+4y^2
(2) 3(-2+3X-X^2)-(4-3X+X^2)
=-6+9x-3x^2-4+3x-x^2
=-4x^2+12x-10
(3) 3X^2-{5X-2(2X-3)}
=3x^2-5x+4x-6
=3x^2-x-6
(4) (2X^2-1/2+3x)-4(X-X^2+1/2)
=2x^2-1/2+3x-4x+4x^2-2
=6x^2-x-5/2
(2) 3(-2+3X-X^2)-(4-3X+X^2)
(3) 3X^2-{5X-2(2X-3)}
(4) (2X^2-1/2+3x)-4(X-X^2+1/2)
要具体过程、不要错误答案、这里没有乘法、只有加减、^2代表2的平方、麻烦速度、谢谢
优质解答
=-3x^2-2xy-8xy+5y^2-2x^2-y^2
=-5x^2-10xy+4y^2
(2) 3(-2+3X-X^2)-(4-3X+X^2)
=-6+9x-3x^2-4+3x-x^2
=-4x^2+12x-10
(3) 3X^2-{5X-2(2X-3)}
=3x^2-5x+4x-6
=3x^2-x-6
(4) (2X^2-1/2+3x)-4(X-X^2+1/2)
=2x^2-1/2+3x-4x+4x^2-2
=6x^2-x-5/2
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