{x+y=20,1.4/100x+3.7/100y=0.625的解为
问题描述:
{x+y=20,1.4/100x+3.7/100y=0.625的解为
答
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