Выполните действия: 1) (3/4+1/20)•1/2 2) (7/12-1/3)•16/19 3) (7 3/5-2 4/15)•9/32 4)...

Question

Выполните действия:
1) (3/4+1/20)•1/2

2) (7/12-1/3)•16/19

3) (7 3/5-2 4/15)•9/32

4) (11/24+1/6)•1 3/5

5) (5 1/2+2 3/5)•5/9

6) (7 - 2 5/16)•4/25

Answer 1

1) (3/4+1/20)•1/2
3/4+1/20=15/20-1/20=14/20=7/10
7/10×1/2=7/20

2) (7/12-1/3)•16/19
7/12-4/12=3/12=1/4
1/4×16/19=4/19

3) (7 3/5-2 4/15)•9/32
7 3/5-2 4/15=5+(9/15-4/15)=5 1/3

4) (11/24+1/6)•1 3/5
11/24+1/6=11/24+4/24=15/24
15/24×8/5=1

5) (5 1/2+2 3/5)•5/9
5 1/2+2 3/5=7+(5/10+6/10)=7 11/10=8 1/10=81/10
81/10×5/9=9/2=4 1/2

6) (7 - 2 5/16)•4/25
7-2 5/16=4 11/16=75/16
75/16×4/25=3/4

Answer 2

1) = 4/5•1/2=2/5
2)7/12-1/3=1/4=4/9