单项选择题


If y is a two—digit number with tens digit t and units digit M and the table above is a multiplication table for t and u (for example，t×u=6)，then y2=（）

A. a+2b+10c
B. 10a+20b+x
C. 10(a+2b+c)
D. 100(a+26+c)
E. 100a+20b+c

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单项选择题
If the value of the expression above is to be halved by doubling exactly one of the five numbers a，b，C，d，or e，which should be doubled（）

A. a
B. b
C. c
D. d
E. e
单项选择题
Pencils have the same unit cost regardless of the number sold．x pencils cost a total of $0.5，and n pencils cost a total of y dollar．（）

A. if the quantity in Column A is greater;
B. if the quantity in Column B is greater;
C. if the two quantities are equal;
D. if the relationship cannot be determined from the information given.
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