請教2月jj 121,139

sydtsou

121.ps.Which of the follow equation has exact one point (x,y) at which both x and y         are integers.
a. x = 2y
b.    y = 3x + 2
c. y = 1/2x +12
d. y = square root of 3 * x
作者答案: D
橙子评价:同意选Ｄ，即确定Ｘ，Ｙ是否有唯一解，感谢大家讨论

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d的x,y不只一组解吧?

139.ps.（1/4）^3＝？
选项包括 0.125 ，0.125^2     ，0.25^2     ，0.25^3     ，0.5^ 2
小猫答案：0.125^2
橙子评价：同意，１／４转换为１／８

0.25^3也对??

donna

agree!!!