Question

Вычтите из обеих частей неравенства -9 1/12 <20 число:1)-7;2)16;3)4 1/6;4)-3 2/3.

Answer 1

1)- 9 1/12-(-7)=-109/12+7/1=-109/12+84/12=-25/12=-2 1/12
20-(-7)=20+7=27
-2 1/12<27
2)-9 1/12-16=-109/12-16/1=-109/12-192/12=-301/12=-25 1/12
20-16=4
-25 1/12<4
3)-9 1/12-4 1/6=-109/12-25/6=-109/12-50/12=-159/12=-13 3/12=-13 1/4
20-4 1/6=20/1-25/6=120/6-25/6=95/6=15 5/6
- 13 1/4<15 5/6
4) -9 1/12-(-3 2/3)=-109/12+11/3=-109/12+44/12=-65/12=-5 5/12
20-(-3 2/3)=20/1+11/3=60/3-11/3=49/3=16 1/3
-5 5/12<16 1/3