7χ÷ 1/2=3/5

9/8÷χ= 1/4

1/7+x=9/ 14

4/9+x= 1

x-3/4=5/6

x+ 1/6=4/3

3/4+x=7/8

x-( 1/2+ 1/3)= 1/6

x- 1/3+2/3=2

x-2=5/6

x+4/5= 1

x- 1/4= 1/3

Fraction simplification generally adopts the following methods:

First find out the median principal component, and determine the numerator part and denominator part. Then these two parts are calculated separately, and the calculation result of each part can be reduced to an offer point. Finally, it is changed to the form of "numerator part/denominator part", and then the result is obtained.

According to the basic properties of fractions, the numerator and denominator of complex fractions are simultaneously amplified by the same multiple (this multiple must be the least common multiple of all denominators of numerator and denominator), so that the denominators of numerator and denominator are removed, and then converted into the simplest fraction or integer through calculation.