(1/18 +1/24)×8+1/18 ×x=1
(X-X*20%-18-(X-X*20%-18)*10%=X*1/2-3(过程)
x(x-1)=18
计算1/[x(x+3)]+1/[(x+3)(x+6)]+.+1/[(x+15)(x+18)]=?
0.75x-1/2x=-5;3x+5=4x+1;3X+5=4X+18;1-7x=x-7;9x+8-7x=3x;-(x-2
(1) x-3/x-2 - x-5/x-4=x-7/x-6 - x-9/x-8
解方程①(x+3/x-1)²-5(x+3/x-1)+6=0 ②x²-2/x+3-6x+18/x
30X-2X=84 5.8X-X=60 6.6X-5X=8 4X-X=24 1.5X-X=1
解一元二次方程.(1)x²+6x=1 (2)x²-14x=18 (3) x²+2x+2=8
1/x(x+3)+1/(x+3)(x+6)+1/(x+6)(x+9)=3/2x+18
X-1/5*X-(X-1/5*X)*1/4=18
若1+x+x*x+x*x*x=0,求x+x*x+x*x*x+.+x(2000次幂)
解方程(5-x)(-5-x)-(x+1)(x+5)=18