28/25X(7/2+14/5)
1x+2x+3x+4x+5x+6x+7x+8x+9x+10x+11x+12x+13x+14x+15x=550
5x-2(7x+1)=14x
|X-1|+|X-2|+|X-3|+|X-4|+|X-5|+|X-6|+|X-7|+|X-8|+|X-9|+|X-10|
x+2x+3x+4x+5x+6x+7x+8x+9x=9x-8x-7x-6x-5x-4x-3x-2x-x.x等于多少?
计算:1/(x^2-7x+10)+1/(x^2-x-2)+1/(x^2+5x+4)+1/(x^2+11x+28)=( )
四道方程:2x+6=5x 6x-28=2x 8(x-3.6)=0.8x 15x-110+7x=110
(x+12)(x-2)+(x+7)(x+8)-(x+5)(x-10),其中x=2
2x+3x+4x+5x+x+6x+7x=100
3道方程题7x-28=5.5x+25(2x-4.8)=6x0.5(x-0.8)=5x-49.4
x+2x-3x-4x+5x+6x-7x.-196x+197x+198x-199x-200x 等于多少
3(7-x)=5x-43 9x-14=2x+56
.8x-3+2x+9=7x+14-5x