Two Calculation Problems in Junior Middle School Mathematics

If the first question is to find the value of x, the answer should be X = 7/6.

Process:

Solution: X+2/3+2/3=2X+7/7.

X+4/6+9/6=2X+ 1

X+ 13/6=2X+ 1

13/6- 1=2X-X

X=7/6

The answer to the second question should be "X=2, Y= 1 or X=-2, Y=- 1" if XY value is required.

Process:

Solution: x? -Really? =(X+Y)(X-Y)=3 ① X？ -2XY+Y？ =(X-Y)(X-Y)= 1 ② Then ①/② is: (x+y) (x-y)/(x-y) = 3/ 1.

(X+Y)/(X-Y)=3/ 1 So: 3(X-Y)=X+Y gives 2X=4Y, so X=2Y.

Bring X=2Y into ① and ② respectively: "When X=2, y =1; When X=-2, Y=- 1 "