x²+4x-5=0计算
已知x-3x+1=0,计算2x-3x-7x+2009
已知a=-6x²+4x,b=-x²-3x,c=5x²-7x+1,小明和小军在计算时对x分别
计算分段函数:y=6x*x+9x-7 (x大于等于0时);y=3x*x+4x-5 (x小于0时)
计算:(x-1)(x^2-4X+3)-x(x^2-5X+2)有过程
计算2(x^3)^2×x^3-(4x^3)^3+(-3x)^4×x^5
计算x²-4x-12=0和 (2x-3)²-121=0
计算:2x/(x-2)(x+1)÷(1-x/x+1)-x²+2x/x²-4?
用简便方法计算 (x-2)(x-3)+(x-4)(x-5)+(x-2)(x-4)+(x-3)(x-5)
计算x-2/5x+120=3/4x
(x-4)/(x-5)+(x-8)/(x-9)-(x-5)/(x-6)-(x-7)/(x-8)分式计算
计算(x*x+4x+5)/(x+2)-(x*x+6x+10)/(x+3)+1
计算x(x-4)-(x+3)(x-3x+2)-2x(x-2)