Question

выполните действия (639-641) (3/4-1/6)*3/7 (4/15+2/3):2/5 (4/9+1/6)*9/11 8/11*(5/6-3/8) 3/5:(4/5-1/2) 3/8*(7/12+3/4)

Answer 1

Ответ:

Пошаговое объяснение:

(3/4-1/6)*3/7 =(9/12-2/12)*3/7=

7/12*3/7=1/4

(4/15+2/3):2/5=(4/15+10/15):2/5=

14/15*5/2=7/3=2 1/3

(4/9+1/6)*9/11=(8/18+3/18)*9/11=

11/18*9/11=1/2

8/11*(5/6-3/8) =8/11*(20/24-9/24)=

8/11*11/24=1/3

3/5:(4/5-1/2) =3/5:(8/10-5/10)=

3/5*10/3=2

3/8*(7/12+3/4)=3/8*(7/12*9/12)=

3/8*16/12=1/2

Answer 2

Выполним данные арифметические операции:

1. (639-641) = -2

2. (3/4-1/6)*3/7 = (9/24-4/24)*3/7 = 5/56

3. (4/15+2/3):2/5 = [(4/15)+(10/15)]/(2/5) = (14/15)/(2/5) = 28/15

4. (4/9+1/6)9/11 = [(44/99)+(11/66)](9/11) = 319/594

5. 8/11*(5/6-3/8) = 8/11*(10/24-9/24) = -1/33

6. 3/5:(4/5-1/2) = 3/5:(2/10) = 3/5*(10/2) = 3

7. 3/8*(7/12+3/4) = 3/8*(7/12+9/12) = 1/2