单选题If b = 4 and c = 7, what is the value of 3b- 5c?A-27B-23C3D6E20
单选题
If b = 4 and c = 7, what is the value of 3b- 5c?
A
-27
B
-23
C
3
D
6
E
20
参考解析
解析：
根据题干b=4，c=7，可知3b-5c= 3(4)-5(7) = 12-35 =-23
根据题干b=4，c=7，可知3b-5c= 3(4)-5(7) = 12-35 =-23
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