2/1x-28=50 4x+3/2=4/5 x-7/2x=28/15 3x-1.2=3.6 0.9x+1.3x=5.28

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2/1x-28=50 4x+3/2=4/5 x-7/2x=28/15 3x-1.2=3.6 0.9x+1.3x=5.28
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2/1x-28=50 4x+3/2=4/5 x-7/2x=28/15 3x-1.2=3.6 0.9x+1.3x=5.28
2/1x-28=50 4x+3/2=4/5 x-7/2x=28/15 3x-1.2=3.6 0.9x+1.3x=5.28

2/1x-28=50 4x+3/2=4/5 x-7/2x=28/15 3x-1.2=3.6 0.9x+1.3x=5.28
1/2X-28=50,同乘2得,x-56=100.x=44
4x+3/2=4/5 4x=4/5-3/2 4x=-7/10,x=-7/40
x-7/2x=28/15 -5/2x=28/15 ,x=12/25
3x-1.2=3.6 3x=4.8 x=1.6
0.9x+1.3x=5.28 2.2x=5.28 x=2.4