90*2+120*(x/90-3-2-2)=x怎么解

解方程：x(3x-4)+2x(x+7)=5x(x-7)+90 若x(3x-4)+2x(x+7)=5x(x-7)+90,则x= 90-x=2x(18+x) *-----------------------------------------------*| 6 4 X | 8 X X | X X 5 || X X X | X X X | X 7 8 || X X X | X X X | X X X ||---------------+---------------+--------------- || X X X | X X X | 5 1 X || X X X | X 6 X | X X X || 8 X X | 3 5 X | 2 X X || （x-2)/30+(x-3)/45+x/90=1 不等式5x^3+10x^2-45x-90 x(x*x-6x-9)-x(x*x-8x-15)+2x(3-x) 填九宫格帮帮忙.x x 6 x x 7 x x 98 x x x 3 x 1 x x 9 x x 6 x 5 x 3 x x x 3 x x x x 1 8x x x 9 x 1 x x x2 1 x x x x 6 x x x 6 x 7 x 3 x x 1 x x 9 x 2 x x x 47 x x 8 x x 5 x x 七年级下册政治复习提纲(山东人民出版社)第五单元是 青春的脚步 青春的气息别弄错了啊!格式：X X X X X X X X X 1、X X X X X X X X X X.2、X X X X X X X X X.3、X X X X X X X X X X X. x+2x+（x+10）=90,x=? (x+1)(x+2)(x+3)(x+4)-120 因式分解（X+1)(X+2)(X+3)(X+4)-120 因式分解（x+1)(x+2)（x+3)(x+4)-120 数学(X+1)(X+2)(X+3)(X+4)-120 x(x-2)(x-3) {x|(x+3)(x-2) -x^3+x^2-x （x^2-2x)(x^2-2x+4)+3(x+1)(x+2)(x+3)(x+4)-120