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单选题
The sum of two numbers is 7 and their difference is 4. Which of the following could be the difference of their squares?
A
-11
B
-3
C
3
D
28
E
3
参考答案
参考解析
解析：
Translate：x+y=7 and x-y=4. (x+y)(x-y)=7×4. x2-y2=28.
Translate：x+y=7 and x-y=4. (x+y)(x-y)=7×4. x2-y2=28.
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