1)0.5x=20+5.40.5x=25.4x=50.82)6.5-4=5xx=0.53)0.8+x=1.8x=14)9.9x=100-1=99x=10
1、0.5(x-10.8)=20x-10.8=40x=50.82、2.5=5xx=0.53、0.8+x=1.8x=14、9.9x=99x=10
x=40+1.8=41.8x=(6.5-4)/5=0.2x=7.2/4-8=-6.2x=(100-1)/9.9=10
50.8 0.5 1 10