3X+(100-X)÷2=100 怎么算?
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3X+(100-X)÷2=100怎么算?3X+(100-X)÷2=100怎么算?3X+(100-X)÷2=100怎么算?3X+(100-X)÷2=1006x+100-x=2005x=100x=20
3X+(100-X)÷2=100 怎么算?
3X+(100-X)÷2=100 怎么算?
3X+(100-X)÷2=100 怎么算?
3X+(100-X)÷2=100
6x+100-x=200
5x=100
x=20