1, 2.5.+ 16. Five tenths to one sixth. -2.5.- 100.-0. 1.

2.(- 16℃ (+35℃) (unnecessary) (+4℃ (-4℃))

3.( 1), (-2000) (2), -2 +3 wins five games (3)- 1200 (4)+330

4. (1)+1929m (2)+3196m (3)-400m

P2

1、-4 -2.5 -0.5 +0.5 +2

2,2 >1.5 > 0.5 >-half >-1.5 >-2 >-4

3.( 1)-20(2)+30 East 30(3)-30 West 30(4)-20(5)-40

P3

1、> > < > < >