4×x+x＝15

4×x+x＝15 通分:x+4/x^2-8x+15,x-5/x^2+x-12,x-3/x^2-x-20 [(x+2)/(x+3)-(x+1)/(x+2)+(x+4)/(x+5)-(x+3)/(x+4)]/[(x的平方+7x+13)/(x的平方+8x+15)] 计算:[(x+2)/(x+3) - (x+1)/(x+2) + (x+4)/(x+5) - (x+3)/(x+4) / (x^2 + 7x + 13)/(x^2 + 8x + 15) 化简：[x+1 -(15/x-1)] * (x-4/x-1) (x+1)(x+2)(x+3)(x+4)-15 7×【2x－3】＋15＝2x－5 x＝?3x－5＝2×【2x－4】 x＝?6x【x－2】－10＝5×【x＋8】 x＝? x+4x＝20 4x＝x+18 (x^2+x-1)-4x^2-4x+7-2x^2+15x-7 15X(4X-8)-5X(2X+10)=6X(5X-20) 1x+2x+3x+4x+5x+6x+7x+8x+9x+10x+11x+12x+13x+14x+15x=550必须用解方程 24道符号^表示平方1,x^+21x+202,x^-8x-203,x^+8x-204,x^-8x-335,x^-4x-326,x^-14x+337,x^+49x+488,x^-14x+489,x^-2x-4810,x^+22x-4811,x^-19x+4812,x^-16x+4813,x^+8x-4814,x^-29x+10015,x^+x-7216,x^+32x-3317,x^-21x-10018,x^+4x+319,x^-6x+520,x^+15x+2621,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(x*x-6x-9)-x(x*x-8x-15)+2x(3-x) x+(x+1)+(x+2)=48x+(x-1)+(x-2)=487×（43-x）+5x+15=10×（43-x）+（x+3）×7（x-3.6）÷4=（x+4.8）÷8（x+10）×4＝（0.6x+10）×5 x+3.2＝4.6 x-1.6＝4 15-x＝2 1.6x＝6.4 15-x＝2+ 2.1÷x＝3的检验是什么 x^2+8x+13/x^2+8x+15-x^2+5x+4/x^2+5x+62/x^2+4x+3+2/x^2+8x+15+2/x^2+12x+35