9條簡易數學MC 15分 今日6時前

1) x + (x+12) = 100 , x = 44

(C)

2)6x + 4(12-x) = 52 , x = 2

(D)

3) 5ax/2b = 1/4

20ax = 2b

x = b/10a

(D)

4) 2(L + 3L/4) = 56 , L = 16

(A)

5) 5(x + 1.7) = 2(1.4 - 2.5x)

5x + 8.5 = 2.8 - 5x

10x = - 5.7

x = - 0.57

(B)

6) x(1 - 3/5) + 78 = 102 , x = 60

(B)

7) Let the no. be 10a + b

then a = 2b

10b + a + 27 = 10a + b

10b + 2b + 27 = 10(2b) + b

12b + 27 = 21b

b = 3

So the no. is 63

(C)

8) (L + 150)/20 = 30

L = 450

(C)

9)

Ⅰis wrong since PQRS may not have 4 equal sides.

PT = QT , ㄥT is common angle , ㄥQ=ㄥP

So △TPS =~= △TQU (A.S.A.)

Ⅱ & Ⅲ are true

(C)

Answers:

Q1) A
Q2) A
Q3) A
Q4) A
Q5) B
Q6) B
Q7) C
Q8) A
Q9) C

希望幫到你啦 =D