1,5,14,30,55,91,x
1,5,14,30,55,91,x
x^3+x-30(分解因式);x^12-y^12;x^15+x^14+x^13.x^2+x+1
求x^2-3x/x^2-6x+9*x^2-11x+30/x^2-5x-1
1x+2x+3x+4x+5x+6x+7x+8x+9x+10x+11x+12x+13x+14x+15x=550
30X-2X=84 5.8X-X=60 6.6X-5X=8 4X-X=24 1.5X-X=1
55-x=7(x+1) 30-3x=0.6(4+5x) 9+2x=3(7-x)解方程,要写出全过程!
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,
12—120%X=6 5分之3X—5%X=5.5 (1+25%)X=7.5 X—30%X=91 4%X+6%X=29.4
已知x²-5x=14,求(x-1)(2x-1)-(x+1..
1、14x(x+6)-6x=8x(2x+5)