化简[10x+(12-x)]-[10(12-x)+x]
(x+2)(x-12)+(x+7)(x+8)+(x+5)(x-10),化简.
(x+12)(x-2)+(x+7)(x+8)-(x+5)(x-10),其中x=2
x*x+2x+x*x+10x+x*x+25+2x+x*x+1+1+16+x*x+4x*x+9-12x+16x*x+4-1
(2x^-5x+2/6x^+13x+6)*(6x^-5x-6/6x^-17x+10)*(12x^+8x-15/2x^-x
X/15 + X/12 + X/10 = 1365,求X,
1.4(x+5)(x+6)(x+10)(x+12)-3x·x
1x+2x+3x+4x+5x+6x+7x+8x+9x+10x+11x+12x+13x+14x+15x=550
化简|x-5|+|x+10|-|x-15|,
|x+5|+|x-7|+|x+10|化简
解方程x²+x-6分之5x+x²-x-12分之2x-5=x²-6x+8分之7x-10
解分式方程(5-2x)/(x^2-x-12)=5x/(x^2+x-6)+(10-7x)/(x^2-6x+8)得
解方程.(5x/x²+x-6)+(2x-5/x²-x-12)=7x-10/x²-6x+8