15×(1/X+1/1.5x)+5×1/x=1要过程

*-----------------------------------------------*| 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 || 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 [(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) (x-1)(x+1)(x+3)(x+5)+15 (x-1)(x+1)(x+3)(x+5)+15 2x(x-1)-x(2x-5)=15 因式分解 (x+1)(x+3)(x+5)(x+7)+15 因式分解 (x+1)(x+2)(x+5)(x+7)+15 (x+1)（x+3)(x+5)(x+7)+15因式分解 （x+1)(x+2)(x+5)(x+7)+15 因式分解 证明(x+1)(X+3)(x+5)(x+7)+15=(X+8x)+22(x+8x)+120 (x+2)(x^2+5x-10)-(x+2)^2(x-1),其中x=1.5 (x+2)(x^2+5x-10)-(x+2)^2(x-1),其中x=1.5, 解方程(x-3/x)-(3-x/x+1)=5x-15/2x+2 x^5+x-1 x+2/x+1-x+3/x+2-x+4/x+3+x+5/x+4 1x+2x+3x+4x+5x+6x+7x+8x+9x+10x+11x+12x+13x+14x+15x=550必须用解方程