7.5-2x=5.52x=7.5-5.52x=2x=2/2x=1 24+6x=63.66x=63.6-246x=39.6x=39.6/6x=6.6 1.6x+4.4=5.21.6x=5.2-4.41.6x=0.8x=0.8/1.6x=0.5(请采纳)
7.5-2x=5.5 2x=2x=124+6x=63.6 6x=63.6-246x=39.6x=6.61.6x+4.4=5.21.6x=5.2-4.41.6x=0.8x=0.5
1 6.6 0.5