(100-2x)(50-2x)=3600怎么做?(100-2x)(50-2x)=3600(50-x)(25-x)=9001250-75x+x²=900x²-75x+350=0这个900怎么来的?别跟我说用什么法拉呜呜.

（100-2X）x（50-2x）=3600算一下x=? (100-2x)(50-2x)=3600 5000-200x-100x+4x(2)=3600 4x(2)-300x+1400=0(100-2x)(50-2x)=36005000-200x-100x+4x^2=36004x^2-300x+1400=0为什么不是5000-3600=200x+100x+4x^2=300x+100x+4x^2-1400=0 x+3x+x-2+x+x+50%x=188 求x x-2x+3x-4x+5x.+99x-100x=25求解 2x+3x+4x+5x+x+6x+7x=100 x/2*50+100=50x (x+1)+(x+2)+(X+3).+(x+50)=1325 x+2x+3x+.+100x f(x)=x^2+x (x y=|x-1|+|x-2|+|x-3|+|x-4|+|x-5|+|x-6|……+|x-99|+|x-100|+50n的最小值 1/X(X+1)+1/(X+1)(X+2)+1/(X+2)(X+3).+1/(X+99)(X+100)= 解方程：2x+4x+6x...+100x=1-(x+3x+5x+...+99x) 1X+2X+3X…+98X+99X+100X=50500X X等于多少? 1x+2x+3x+4x+5x+6x+7x…+99x=100 (100-2x)(50-2x)=3600怎么求? （100-2x）（50-2x）=3600 （100-2x）（50-x）=3600 100(X - 2) + 10X + 2X = 100*2X + 10X + X - 2 - 495