49:(5+x)=14:2

1x+2x+3x+4x+5x+6x+7x+8x+9x+10x+11x+12x+13x+14x+15x=550 已知x*x-5x=14,求(x-1)(2x-1)-(x+1)*(x+1)+1的值 5x+2=-8 x=30 3x=5x-14 x (x-1)(2x-1)-(x+1)2+1,其中x²-5x=14, 1、14x(x+6)-6x=8x(2x+5) 已知x²-5x=14,求(x-1)(2x-1)-(x+1.. 2x^2+14x+49=169,求x. x^5+x^4 = (x^3-x)(x^2+x+1)+x^2+x 4x+5x+14=42-2(x+3) 5x-2(7x+1)=14x x-2/5x+14=1/4x, (5x+14)÷(x+2)=?