已知m-n=25.8mn=35.2求m×n等于多少 m-n=25.8m+n=35.2两式相加m-n+m+n=25.8+35.22m=61m=30.530.5-n=25.8n=30.5-25.8=4.7mxn=30.5x4.7=143.35...
