挑战习题
1/5单选题
难度:

1.

若A*B表示(A+3B)×(A+B),求5*7的值为(    )


A

310

B

311

C

312

D

313

提示1:
PHA+6YG15b6q5paw6L+Q566X5rOV5YiZPC9wPg==
正确答案:Qw==
PGRpdj7op6PvvJo1KjfvvJ3vvIg177yLM8OXN++8icOX77yINe+8izfvvIk8L2Rpdj48ZGl2Pu+8ne+8iDXvvIsyMe+8icOXMTLvvJ0zMTLjgIA8L2Rpdj4=