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Назерке2017
@Назерке2017
July 2022
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Найдите неизвестный член пропорций:
1)х:8/9=3:4 4)6,5:5,2=х:8
2)х:2,8=5:7 5)4,5:3,6=х:4
3)12:7=9:х 6) 14:4=х: 1 1/3
/-это дробная черта
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cccp82
Verified answer
1)x:8/9=3:4
x*4=3*8/9
4x=8/3
x=2/3
2)x:2,8=5:7
x*7=5*2,8
7x=14
x=2
3)12:7=9:x
12:7=9:x, x≠0
12x=9*7
12x=63
x=21/4, x≠0
x=21/4
4)6,5:5,2=x:8
6,5*8=x*5,2
52=5,2x
5,2x=52
x=10
5)4,5:3,6=x:4
4,5*4=x3,6
18=3,6x
3,6x=18
x=5
6)14:4=x:11/3
14*11/3=x*4
154/3=4x
4x=154/3
x=77/6
x=12 5/6
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Answers & Comments
Verified answer
1)x:8/9=3:4x*4=3*8/9
4x=8/3
x=2/3
2)x:2,8=5:7
x*7=5*2,8
7x=14
x=2
3)12:7=9:x
12:7=9:x, x≠0
12x=9*7
12x=63
x=21/4, x≠0
x=21/4
4)6,5:5,2=x:8
6,5*8=x*5,2
52=5,2x
5,2x=52
x=10
5)4,5:3,6=x:4
4,5*4=x3,6
18=3,6x
3,6x=18
x=5
6)14:4=x:11/3
14*11/3=x*4
154/3=4x
4x=154/3
x=77/6
x=12 5/6