-21(2/21+8/21)=? 10 2/5(5/13-1 9/26)=? РЕШИТЕ ПОЖ
-21 * 10/21 = - 10 10 цел 2/5 (10/26 - 35/26) = 52/5 * (- 25/26) = -10
везде -10??
да