4x=6.8-1.84x=5x=5/43/5x=4-3/103/5x=37/10x=37/10 /(3/5)x=6又6分之1(9.5-4)x=2.755.5x=2.75x=2.75/5.5x=0.5
4x+3*0.6=6.8 4x+1.8=6.84x=6.8-1.84x=5x=1.25五分之三x+十分之三=4 6x+3=406x=37x=37/6 9.5x-4x=2.75 5.5x=2.75x=0.5