4(x-2)(x+5)=(2x-3)(2x+11)+11
1x+2x+3x+4x+5x+6x+7x+8x+9x+10x+11x+12x+13x+14x+15x=550
x^5+x^4 = (x^3-x)(x^2+x+1)+x^2+x
解方程x(2x-3)+3x+3x(x-2)=5x(x-4)+11
(2x-1)/(x-1)(x-2)=(x-5)/(x-2)(x-3) x/2x^2-11x-21=(x+7)/x^2-1
x+2x+3x+4x+5x+6x+7x+8x+9x=9x-8x-7x-6x-5x-4x-3x-2x-x.x等于多少?
5x(x+7)(x+4)=5x(x^2+11X)
2x+3x+4x+5x+x+6x+7x=100
x+2/x+1-x+3/x+2-x+4/x+3+x+5/x+4
解方程:11(6-x)/3(x-4)=10(5-x)/3(x-4)-5(6-x)/x-2
已知 X=4- 根号3 求 (X*X*X*X-6X*X*X-2X*X+18X+23) / (X*X-8X+15)的值
x的平方-2x+1=15 ; x(2x-5)=4x-10 ; x的平方+5x+7=3x=11
|X-1|+|X-2|+|X-3|+|X-4|+|X-5|+|X-6|+|X-7|+|X-8|+|X-9|+|X-10|