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aminarowa2014
@aminarowa2014
July 2022
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Реши уравнения 15/(а+2)=6/(2а+7), 12b-7/(b+4)=26-4b , 5/(3c+2)=8/(9-2c) , 10k+2/(7k-2)=5/(4k+3)+3k .
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Сент20161
1) 15*(a+2)= 6*(2a+7)
15a+30=12a+42
15a-12a=42-30
3a= 12
a=4
2) 12b-7*(b+4)= 26- 4b
12b-7b-28= 26-4b
5b+4b=26+28
9b= 54
b= 6
3) 5 * (3c + 2) = 8 * (9 - 2c)
15c+10= 72-16c
15c+16c= 72-10
31c=62
c=2
4)
10k + 2 * (7k - 2 ) = 5 * ( 4k + 3 ) + 3k
10k+ 14k-4=20k+15+3k
24k-4=23k+15
24k-23k=15+4
1k=19
k= 19:1
k=19
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Answers & Comments
15a+30=12a+42
15a-12a=42-30
3a= 12
a=4
2) 12b-7*(b+4)= 26- 4b
12b-7b-28= 26-4b
5b+4b=26+28
9b= 54
b= 6
3) 5 * (3c + 2) = 8 * (9 - 2c)
15c+10= 72-16c
15c+16c= 72-10
31c=62
c=2
4)10k + 2 * (7k - 2 ) = 5 * ( 4k + 3 ) + 3k
10k+ 14k-4=20k+15+3k
24k-4=23k+15
24k-23k=15+4
1k=19
k= 19:1
k=19