А) 11/15×(4/9×15/22) б) 1/10 × 22 ×30 × 1/11 в) 11/15 × 5/26+5/26×2/15 г) 5/34×7/9-5/34×4/27 д) 49/64 × 8/9+11/32×8/9-3/64×8/9. , я болела и пропустила тему.

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марян7878

Математика

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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) = = 2/9 б) 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 = 6 в) 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) = 1/6 г) 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) = 5/54 д)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