1.?N = 2a + b. a is a two-digit square number, and b is a two-digit cube number. What is the smallest possible value of N???(N=2a+b,a、b均為兩位數,a是某數的平方,b是某數的立方,求N的最小值)
A. 57 ???B. 58 ???C. 59 ??D. 60
2. Solve 3(x-2) = 21?(3( X-2 )=21,求X)
A. 7 ????B. 9 ????C. 18 ??D. 3
3. Work out the Highest Common Factor (HCF) of 110 and 132。(求110和132的最大公因數)
A. 19 ??B. 20 ??C. 22 ???D. 25
4. There are 40% more black balls than white balls in a bag. Work out the ratio of black balls to white balls. Give your answer in the simplest form.(一個袋子中黑球的數量比白球數量多40%,求黑球和白球的數量比(最簡形式)
A. 4:6 ??B. 3:5 ??C. 6:10 ??D. 7:5
5. Rearrange the formula y = (3x + 5)/x to make x the subject.(把方程式?y = (3x + 5)/x?換成?x做主語的等式)
A. x=5(y-3) ?B. x=5/(y-3) ?C. x=5y+3 ?D. x=( 3y+5)/y
6. When (x-2)2 + 7 has a minimum value, what is the value of x??(當(x-2) 2+7最小時,求x的值)。