Найдите x в пропорциях:#3,4. Created by S876lLAURA876S. matematika-ru

Найдите x в пропорциях:#3,4...

S876lLAURA876S @S876lLAURA876S

September 2021 1 11 Report

Найдите x в пропорциях:#3,4

Answers & Comments

TigerYa

Verified answer

3)) 2,7/9= (1 1/5)/(3х+1)
2,7•(3х+1)=9• 1 1/5
2,7•3х+2,7•1=9• 1 (1•2)/(5•2)
8,1х+2,7=9• 1 2/10
8,1х+2,7= 9• 1,2
8,1х+2,7=10,8
8,1х=10,8-2,7
8,1х=8,1
Х=8,1:8,1
Х=1

Проверка
2,7/9= (1 1/5)/(3х+1)
0,3= 1,2/(3•1+1)
0,3=1,2/4
0,3=0,3

4)) (1 4/5)/2,5= 7,2/(6х+1)
1 4/5• (6х+1)= 2,5•7,2
1 (4•2)/(5•2)• (6х+1)=18
1 8/10• 6х+ 1 8/10• 1=18
1,8•6х+ 1,8•1=18
10,8х+1,8=18
10,8х=18-1,8
10,8х=16,2
Х=16,2:10,8
Х=1,5

Проверка
(1 4/5)/2,5= 7,2/(6х+1)
1,8/2,5= 7,2/(6•1,5+1)
0,72=7,2/10
0,72=0,72

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