( 1)6006400 6 10

(2)a- 1.2×b

(3) 1.4 1

(4)94 95 95

(5)502.4

(6)> < >

(7)5 28

(8) 180 cm2

(9) 1:500000

( 10)5/ 12 150

( 1 1)8 12

Page 49

No, yes, no, yes.

ccdcb

0.43 200 5 9 1/5 5 4/ 15 3/20 3/5 1

2 3/5-4x= 1.2

Solution: 4x = 2 3/5-1.2

4x=7/5

x=7/5× 1/4

x=7/20

8:x= 1/3: 1/4

1/3x=8× 1/4

1/3x=2

x=2×3

x=6