(2) 45÷(7+3)=4.5
(3) (45+3)÷(7-3)= 12
2. Put X pigeons under the tree
(X- 1)÷(X+2+X)= 1/3
The solution is X=5.
There are five pigeons under the tree and seven pigeons on the tree.
6.400(X+Y)= 32
400(X-Y)= 180
7.5×4÷2 = 10
8. According to the meaning of the question: X= 5.5 Y=-1.5 or X=-1.5 Y=5.5.
So: X-Y = 7 or -7.
At the same time, pay attention to the unit and format of application questions and form good habits.
(Advanced Mathematics and Integral Application Research Association) sincerely answers for you,
Have a nice summer vacation. ...