{x+y=20,1.4/100x+3.7/100y=0.625的解为

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{x+y=20,1.4/100x+3.7/100y=0.625的解为
{x+y=20,1.4/100x+3.7/100y=0.625的解为

{x+y=20,1.4/100x+3.7/100y=0.625的解为
y=20-x
代入0.014x+0.037y=0.625
0.014x+0.74-0.037x=0.625
0.023x=0.115
所以x=5
y=20-x=15