A*B=3A+4B已知7*x=45
问题描述:
A*B=3A+4B已知7*x=45
答
7*x=45
21+4x=45
4x=24
x=6
A*B=3A+4B已知7*x=45
7*x=45
21+4x=45
4x=24
x=6