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64 * 9/16 - 9*25/9=36-25=11
b) √121 :(37/88)° -(2⅕)² x (1/11)²= 11 : 1 - (11/5)² x 1/121 =
11 :1- 121/25 x 1/121 = 11- 121/25 x 1/121=11-1/25=11-0,04= 10,96