各位知識朋友 , 入黎幫我手 ar !!! ( 數學F.1 ) (1)

1. +10 is high temp and -3 is low temp... = 13
2. (-3)+(-12)= -15
3. +7 + (-3) = 10
4. 7 - 4 = 3
5. 5 - 3 = 2

1.If today maximum temperature is 10 and the lowest temperature is -3℃,
what is the difference between the maximum temperature and the lowest
temperature?

10--3
=10+3
=13℃
2.On a winter day,the temperature dropped from -3 at 10 a.m to -12℃ at
5p.m .Find the change in temperature.

-3-12
=3-12
=19℃
3.Xerox took a lift from the 7th floor to the 3rd basement.Find the change
in level.

7--3
=7+3
=10 floors


4.Johnson walked 4 km to the west,and then he walked 7 km further in the same direction.Taking the east as the positive direction,use a directed number to represent
his final position from the starting point.

4+7
=w13 or13w


5.Gloria walked 3 km to east,and then walked 5 km to the wast.Taking the east
as the positive direction,use a directed mumber number to represent her final
position from the starting point.

3-5
=w2 or2w