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问题: 帮帮忙 解个简单方程

(3000-x)×2.25%+0.03%x×12=3048.6-3000

解答:

(3000-x)×2.25%+0.03%x×12=3048.6-3000
3000*0.0225-0.0225x+0.0036x=48.6
67.5-0.0189x=48.6
0.0189x=18.9
x=1000