11000(1-14%)^X=7000
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
(x-1)(2x-1)-(x+1)2+1,其中x²-5x=14,
解方程 x(x+1)(x²-2x-4)=0 x³-2x+1=0 x的4次方+8x³+14x
已知x²-5x=14,求(x-1)(2x-1)-(x+1..
1、14x(x+6)-6x=8x(2x+5)
3/2(x-14)-2(x+1)=2x
5x-2(7x+1)=14x
x-2/5x+14=1/4x,
X-2/7X=1/14
方程:12x+36-6x=102 2x-48-x=54 2x-1+x=14
化简再求值:X^2+5X-14+(X+1)(X^2+2X+1)其中X=5