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急急急5(x+1.1)=15.5x+1.1=15.5/5x=3.1-1.1x=236x+25x=12.261x=12.2x=12.2/61x=0.212(x+4)=144x+4=144/12x=12-
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5(x+1.1)=15.5
x+1.1=15.5/5
x=3.1-1.1
x=2
36x+25x=12.2
61x=12.2
x=12.2/61
x=0.2
12(x+4)=144
x+4=144/12
x=12-4
x=8
2x-37=21.2
2x=21.2+37
x=58.2/2
x=29.1
5x+17=42
5x=42-17
x=25/5
x=5
11x-8x=8.7
3x=8.7
x=8.7/3
x=2.9
4(x+3.2)=100
x+3.2=100/4
x=25-3.2
x=21.8
9x+25=79
9x=79-25
x=54/9
x=6
21x-15x=0.36
6x=0.36
x=0.36/6
x=0.06
3x+8.7=16.5
3x=16.5-8.7
x=7.8/3
x=2.6