1\а - 1\2а = ?7\3а-3b - 5\2a-2b = ?x\x"2-4 - 2\x+2 = ?

Question

1\а - 1\2а = ?

7\3а-3b - 5\2a-2b = ?

x\x"2-4 - 2\x+2 = ?

Answer 1

1/a - 1/2a = 2/2a - 1/2a = 1/2a

7/3a-3b - 5/2a-2b = (14-15)/6a-6b = 1/(6a-6b)

x/(x²-4) - 2/(x+2) = (x-2(x-2))/(x-2)(x+2) = (4-x)/(x²-2²)

Comments

спасибо))