1）比大小（大于、小于、等于、不能确定 四个选项）

题目

1）比大小（大于、小于、等于、不能确定 四个选项）
A、The greatest prime factor of 126
B、the zeros of f(x) = x2（x的平方）+x-42 (这个选项看不懂啊,）
2）a、b and c are all even integers,which of the following could be the value of a平方+b平方+c平方?
请问420是其中一个答案吗?
3）The store sels two kinds of bags A and B,the selling price of A is 60 and the cost is 45,the selling price of B is 80 which include a markup that was 25 percent of the cost of B.What is the profit for sellin 100 A bags and 50 B bags?
A、2300
B、1500
C、1700
D、2100
E、3200
因为我感觉缺了B的条件,所以不理解.
4）n=a的平方,the factors of n include 4,5,6
比大小：A、the least value of n
B、30
5) A couple have two children:one is a boy.What is the probability that both are boys?
A、1/3 B、1/2 C、3/4 D、2/3 E、1/4
这题我觉得应该是B啊,因为其中一个孩子的性别已经确定了.但是答案不对.

答案