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LJкрасотка200711
@LJкрасотка200711
May 2021
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Найдите корни уравнений
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rpephxlk
Verified answer
А) 26+3x=50
3x=50-26
3x=24
x=8
б) 480 :y-19=41
480:y=60
y=480:60
y=8
в) 160:t+18=25*2
160:t=32
t=5
г) k:7-34=78:3
k:7-34=26
k:7=60
k=7*60
k=420
д) 9*9-540:(a-27)=15*5
9*9-540:(a-27)=75
(81a-2187-540)/(a-27)=75
(81a-2727)/(a-27)=75
81a-2727=75a-2025
81a-75a=2727-2025
6a=702
a=117
e) 80*b-3*90+430=1600:2
80b=800+270-430
80b=640
b=8
ж) 6 1/7 - (c+2 4/7) = 2 5/7
-c-2 4/7= 2 5/7 - 6 1/7
-c-2 4/7=19/7-43/7
-c-2 4/7=-24/7
-c=-24/7+18/7
-c=-6/7
c=6/7
з) 3 5/16+(d-1 7/16)= 9 1/16
d-23/16=145/16-53/16
d=145/16-53/16+23/16
d=115/16=7 3/16
2 votes
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Answers & Comments
Verified answer
А) 26+3x=503x=50-26
3x=24
x=8
б) 480 :y-19=41
480:y=60
y=480:60
y=8
в) 160:t+18=25*2
160:t=32
t=5
г) k:7-34=78:3
k:7-34=26
k:7=60
k=7*60
k=420
д) 9*9-540:(a-27)=15*5
9*9-540:(a-27)=75
(81a-2187-540)/(a-27)=75
(81a-2727)/(a-27)=75
81a-2727=75a-2025
81a-75a=2727-2025
6a=702
a=117
e) 80*b-3*90+430=1600:2
80b=800+270-430
80b=640
b=8
ж) 6 1/7 - (c+2 4/7) = 2 5/7
-c-2 4/7= 2 5/7 - 6 1/7
-c-2 4/7=19/7-43/7
-c-2 4/7=-24/7
-c=-24/7+18/7
-c=-6/7
c=6/7
з) 3 5/16+(d-1 7/16)= 9 1/16
d-23/16=145/16-53/16
d=145/16-53/16+23/16
d=115/16=7 3/16