已知a+2b+3c=3,5a+c=4则3a+b+2c的值是

问题描述:

已知a+2b+3c=3,5a+c=4则3a+b+2c的值是

a+2b+3c=3,5a+c=4
6a+2b+4c=7
3a+b+2c=3.5