а) 11/15 × (4/9 × 15/22) == 11/15 × 4/9 × 15/22 == (11*4*15)/(15*9*22) == (11 * (2*2) * 15) / (15 * 9 * (11*2) ) == (1 * 2 * 1) / (1 * 9 * 1) == 2/9б) 1/10 × 22 × 30 ×1/11 == 1/10 × (22/1) × (30/1) × 1/11 == (1 * (11*2) * (3*10) * 1) / ( 10*1*1*11) == (2*3)/1 = 6в) 11/15 × 5/26 + 5/26 × 2/15 == 5/26 × (11/15 + 2/15) = = 5/26 × 13/15 = = (5*13)/(26*15) = = 1/(2*3) = 1/6г) 5/34 × 7/9 - 5/34 ×4/27 == 5/34 × (7/9 - 4/27) == 5/34 × ( 21/27 - 4/27) == 5/34 × 17/27 == (5*17)/(34*27) == (5*17) / ( 2*17*27) == 5/(2*27) = 5/54д)49/64 ×8/9 +11/32 ×8/9 - 3/64 × 8/9 == 8/9 × (49/64 + 11/32 - 3/64 ) == 8/9 × (49/64 + 22/64 - 3/64 ) == 8/9 × 68/64 == (8*68)/(9*64) = =(8*4*17) / (9 * 8*8) == 17/(9*2) = 17/18