(2x-5y)-(3x-5y+1) 2(2-7x)—3(6x+5)
7x+[-3x-3(x-2y)]-[5x-(2x-y)]
化简 (x+y)(x²-xy+y²) ; 3(2x-1)(x+6)-5(x-3)(x+6)
2(x-y)+3(x+y)2-5(x-y)-8(x+y)2-(x-y)
去括号并合并同类项(1)3x-2(x+7)+2(2x+5) (2)(4x-3y)-[-(3y-x)+(x-y)]-5x
化简1) (-2x^ y^)(3x^ y^)(-4x^ y^)2) (6√x)\(3√x√x^5)3)已知函数f(x)的
计算:(3x-y)2-(2x+y)2+5x(y-x)
(3x-y)²-2x(4x-5y)-(x+2y)²
((x+2y)x^2+(x-y)(3x-y)-5y^2)÷2x
(1)已知x+y=6,x²-y²=5,求x-y的值(2)若x+y=3,x²+y²
5/12[-4/3(x-y)^3] *(x+y)^2 * (-x-y)^3 * 5/6(y-x)^2
10/x+y+3/x-y=-5 15/x+y-2/x-y=-1(用换元法解此方程组)
若3x-5y=0,则x+y/x=(),x-y/y=(),2x-3y/2x+3y=( )