如题所述
X=180-90-50=40
X=(180-40)/2=70
X+(X+10)+[180-(x+70)]=180
X+X+10+180-X-70=190
2X=190-10-180+70
x=70/2
x=35
X+(X+10)=360-60-90
X+X+10=210
2X =210-10
x=100
x+x+(x+20)+(x-10)=540-70
X+X+X+20+X-10 =470
4x =470+10-20
x =460/4
x=115