Question

计算：（1）x+1/x-1/x,（2）a/b+1+2a/b+1-3a/b+1

Answer 1

(1)( x+1-1)/x = 1 (2) (a + 2a - 3a)/(b+1) = 0 (3) (3cd² + 2c²d)/6c^3d^3

(4) [3/(2m-n)] - [1/(2m-n) ]= 2/(2m-n)

(5)[a/(a²-b²)] -(a-b)/(a²-b²) = b/(a²-b²)

(6)[a²/(a-1)] - [(a-1)x(a-1)]/(a-1)

=(a² - a² +2a - 1)/(a-1)

=(2a - 1)/ (a-1)