2.8+1.1x=7-0.1x解方程·,

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2.8+1.1x=7-0.1x解方程·,2.8+1.1x=7-0.1x解方程·,2.8+1.1x=7-0.1x解方程·,1.2x=7-2.8=4.2,x=3.5

2.8+1.1x=7-0.1x解方程·,
2.8+1.1x=7-0.1x解方程·,

2.8+1.1x=7-0.1x解方程·,
1.2x=7-2.8=4.2,x=3.5