x-4/9-5/9x=2/3
x-5/9x=2/3+4/9
(1-5/9)x=6/9+4/9
4/9 x=10/9
4x=10
x=10÷4
x=2.5
如图
两边同时乘以9x有9x²-4x-5=6x,即
9x²-10x-5=0,用求根公式有
x₁,₂=[10±√(100+180)]/(2×18)
=(5±√70))/×18
X-4/9-5/9x=2/3
解:4/9X-4/9=2/3
4/9X=6/9+4/9
X==10/9÷4/9
X=5/2
x-5/9x-4/9=2/3
4/9x=2/3+4/9
4/9x=10/9
x=5/2