X-1.5/0.5+0.4X+1/0.2=1

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X-1.5/0.5+0.4X+1/0.2=1X-1.5/0.5+0.4X+1/0.2=1X-1.5/0.5+0.4X+1/0.2=1X-1.5/0.5+0.4X+1/0.2=1两边同时乘以2,得4(x

X-1.5/0.5+0.4X+1/0.2=1
X-1.5/0.5+0.4X+1/0.2=1

X-1.5/0.5+0.4X+1/0.2=1
X-1.5/0.5+0.4X+1/0.2=1
两边同时乘以2,得
4(x-1.5)+10(0.4x+1)=2
4x-6+4x+10=2
8x=2-4
8x=-2
x=-4分之1

X-3+0.4X+5=1
1.4X=-1
X=-5/7