2.5%X+(20-X)*2.25%=0.485

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2.5%X+(20-X)*2.25%=0.4852.5%X+(20-X)*2.25%=0.4852.5%X+(20-X)*2.25%=0.4852.5%X+20*2.25%-2.25%X=0.4850

2.5%X+(20-X)*2.25%=0.485
2.5%X+(20-X)*2.25%=0.485

2.5%X+(20-X)*2.25%=0.485
2.5%X+20*2.25%-2.25%X=0.485
0.25%X+20*2.25%=0.485
0.25%X=0.485-20*2.25%
0.25%X=0.485-0.45
0.25%X=0.035
X=14

2.5%x+(20-x)2.25%=0.485 不对应该是: 2.5%x+(20-x)2.25%=0.485 x——万元或者 2.5%x+(200000-x)2.25%=4850 x——元

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