-7x(-3)x(-0.5)+(-12)x(-2.6)=
解方程:(x-8)/(x-3)-(x-9)/(x-4)=(x+7)/(x+8)-(x+2)/(x+3)
(1) x-3/x-2 - x-5/x-4=x-7/x-6 - x-9/x-8
初一数学x*x+2x+5的值为7,请求3x*x+6x+3的值.因为x*x+2x2x+3=3x(x*x+2x)+2x+2x
4(x+3)=2x+2 7(x-1)=2x+3 4x+20=6x-30 4x-12=2x 2x-3=x+7 3x-4=2
解不等式x(x-3)>(x+7)(x-7)
解方程.(5x/x²+x-6)+(2x-5/x²-x-12)=7x-10/x²-6x+8
5x/(x+3)(x+2)+(2x-5)/(x-4)(x+3)=(7x-70)/(x+2)(x+4)
f(x)=x²+3x|x-2|
2x²+7x+1=0 x(x-1)=3x+7
[x(x+1)+x平方(x-1)]+(-3x)
解方程(x-2)X(x的平方-6x-9)=x(x-5)X(x-3)
3x^-12x-2根号(x^-4x+7)+13=0