-2x^2y+xy+13xy-(-5x^2y)化简

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-2x^2y+xy+13xy-(-5x^2y)化简
-2x^2y+xy+13xy-(-5x^2y) a-(3a+b)+2（a-2b）

-2x^2y+xy+13xy-(-5x^2y)
=-2x^2y+xy+13xy+5x^2y
=(-2x^2y+5x^2y)+(xy+13xy)
=3x^2y+14xy
a-(3a+b)+2（a-2b）
=a-3a-b+2a-4b
=(a-3a+2a)-(b+4b)
=0-5b
=-5

（xy-x^2)乘以(xy)/(x-y) （x^2+xy/x-y)/（xy/x-y)计算 (x+y-2xy)(x+y-2)+(1-xy)² (x^2-xy)y÷y-x/xy怎么做? x^3y(-4y)^2+(-7xy)^2*(-xy)-5xy^3*(-3x)^2 (x-2xy)*(-xy+2y*y)-(3x*x-2xy)(x-9xy+6y*y) 化简：x-y/x+3y÷x^-y^2/x^2+6xy+9y^2-(xy/x+y) 化简:-(x^2-2xy-y^2)+(5x^2-2xy-3y^2) 化简 -(x^2-2xy-y^2)+(5x^2-2xy-3y^2) 化简（3X²-XY+Y²）-5(X²-XY+2Y²） 5x^2y/-1/2xy*3xy^2 x-y/x²÷x²-2xy+y²/xy*（xy-x²）