a) (a + b + ab + a²)/(a + b) dla a≠b (a + b + ab + a²)/(a + b) = ((a + b) + a(b + a))/(a + b) = 1 + a b) (2a + b + ab + 2)/(a + 1) dla a≠1 (2a + b + ab + 2)/(a + 1) = ((2a + 2) + (b + ab)) / (a + 1) = = (2(a + 1) + b(a + 1)) / (a + 1) = = (a + 1)(2 +b) / (a + 1) = 2 + b
a) a+b+ab+a² (a+b)+a(b+a) (a+b)(1+a) ----------------------=-------------------------- = ------------------------=1+a dlaa≠-b a+b a+b a+b 2a+b+ab+2 2(a+1)+b(a+1) (a+1)(b+2) b)--------------------- =------------------------------ = -------------------------- =b+2 a+1 a+1 a+1 dla a≠-1