Write 1+4 and 9_with a common denominator. t+5
t-1
212 + 121 + 16 and 181 +36
21+4
21+4
72 +91 +20 and
(1 + 5)(1 - 1)
91-9
(1 + 5)(1 - 1)
12-31+4 and 91-5
(t + 5) (1 - 1) (t + 5)(1 - 1)
12 +31-4 and
(1 + 5)(1 - 1)
91 +45
(t + 5)(1 - 1)