16X+262=16x*0.8+518
x-0.8x=16 x=?
X*X+(0.8X)*(0.8X)=16*16 X等于几?
x+3x=-16
x-1/4x=1/2 16x(3-2/9) x-0.8x=22
x/x-4 - 32/x的平方+16=1 x+1/x + 5X/x+1=6
解方程,帮个忙x+6=0.8x+16 x/2+x/3=12 x-1/4x=7/8 12x/4=16.84x-10%x=7
x-o.8x=6 12x-8x=4.8 3x-8=16 7.5x-2x x-0.7x=3.6 求答案
130%x+x=4.6 x÷50%=10 x/9-x/15=16%
(x-2)/(x+2)-16/(x^2-4)=(x+2)/(x-2)
(x-2)/(x+2)=(x+2)/(x-2)+16/(x平方-4)
x-2/x+2-16/x^2-4=x+2/x-2用换元法解
先化简,再求值:x²-4x/x²-8x+16,其中x=5.