m-2/n=2 2m+3n=12 要x_数学解答

m-2/n=2 2m+3n=12 要x

人气：112 ℃　时间：2020-03-25 01:31:50

解答

m-2=2n2m+3n=12n=8/7 m=30/7m-(2/n)=2 (m-2)=2/n 4/n-8+3n=0 3n^2-8n+4=0 n=2 n=2/3 m=3 m=5