0.8[x-2]=6.4
X-0.8X=2
20+0.8x=x-14 112-4x=2x(80-4x)
2X+0.8(24-X)=30
2(X+0.8X)=108
x-4/1x=8/3 x-0.8x=22 3/2x+2/1x=42
解方程X-0.5X=15 X-0.8X=10 2.5X+2X=9
0.3x²+x=0.8 x²+3=2√3x x²+2x-2=0 3x²+4x-7
四道方程:2x+6=5x 6x-28=2x 8(x-3.6)=0.8x 15x-110+7x=110
六道解方程4×(0.8-x)=1.45+2/3x-1/2x=1210x+9=8x+19115%x+15%x=1.32x-
x-78%x=8.8 (1+25%)x=46 25%x/2=5 x+30%x=52 6%x-0.8%x=10.4 7.3
x^5+x^4 = (x^3-x)(x^2+x+1)+x^2+x
x/x平方-x+2=2x/x+1