2/5x+2/5y=1200 怎样解
问题描述:
2/5x+2/5y=1200 怎样解
答
∵2/5x+2/5y=1200
∴同时乘以5/2*xy得;x+y=3000xy
∴(3000x-1)y=x
∴y=x/(3000x-1)