1.幾個小立方體黏在一起成一個大立方體6個面被涂成紅色,if exactly 27 of small cubic blocks that make up the large cube have no paint on them ,how many cubic blocks make up the large cube?125}
2.in a sequence of nmbers,the first number is2and each number is 2 more than 3 times the preceding number.what's the forth number in the sequence?{答案80}
3.if40,404+x=44,444,then40,404-10x=?
4how many positive four-digit integers have 1 as their first digit and 2or 5as their last digit?{答案200}
5.Ifq and r are positive numbers,what percent of (q+1)is {答案100r/q+1%}
6.if a and b are integers such that a+b