найдите значение выражения: 1) 15 4/9 - 4 4/9 × 3 3/8; 2) 81/88 × ( 6 - 1 13/15 × 1 19/21); 3) ( 5 1/16 - 1 1/8)(5/6 3/14); 4) 5 1/16 - 1 1/8 × ( 5/6 3/14).
Ответы
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№1.
15 4/9 - 4 4/9 × 3 3/8 = 4/9
1) 4 4/9 × 3 3/8 = 40/9 × 27/8 = (5×3)/(1×1) = 15/1 = 15
2) 15 4/9 - 15 = 4/9
№2.
81/88 × (6 - 1 13/15 × 1 19/21) = 2 1/4
1) 1 13/15 × 1 19/21 = 28/15 × 40/21 =
=(4×8)/(3×3)=32/9=3 5/9
2) 6 - 3 5/9 = 2 4/9
3) 81/88 × (2 4/9 ) = 81/88 × 22/9= 9/4= 2 1/4
№3 -№4 условие некорректное
(5 1/16 - 1 1/8 ) ( 5/6 ??? 3/14)
5 1/16 - 1 1/8 × (5/6 ??? 3/ 14)
15 4/9 - 4 4/9 × 3 3/8 = 4/9
1) 4 4/9 × 3 3/8 = 40/9 × 27/8 = (5×3)/(1×1) = 15/1 = 15
2) 15 4/9 - 15 = 4/9
№2.
81/88 × (6 - 1 13/15 × 1 19/21) = 2 1/4
1) 1 13/15 × 1 19/21 = 28/15 × 40/21 =
=(4×8)/(3×3)=32/9=3 5/9
2) 6 - 3 5/9 = 2 4/9
3) 81/88 × (2 4/9 ) = 81/88 × 22/9= 9/4= 2 1/4
№3 -№4 условие некорректное
(5 1/16 - 1 1/8 ) ( 5/6 ??? 3/14)
5 1/16 - 1 1/8 × (5/6 ??? 3/ 14)
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