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LizaBalihina
@LizaBalihina
June 2022
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Помогите номер 517!!!!
Пожалуйста!!
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Alinnel
15*(а+2)=6*(2а+7)
разделим все на 3, получим:
5*(а+2)=2*(2а+7)
5а+10=4а+14
5а-4а=14-10
а=4
12b-7*(b+4)=26-4b
12b-7b-28=26-4b
12b-7b+4b=26+28
9b=54
b=6
5*(3c+2)=8*(9-2c)
15c+10=72-16c
15c+16c=72-10
31c=62
c=2
10k+2*(7k-2)=5*(4k+3)+3k
10k+14k-4=20k+15+3k
10k+14k-20k-3k=15+4
k=19
0 votes
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Ritchie007
Мое правильное:
1)15*(a+2)=6*(2a+7)
15a+30=12a+42
15a-12a=42-30
3a=12
a=12:3
a=4
2)12b-7*(b+4)=26-4b
12b-7b+(-28)=26-4b
12b-7b+4b=26+28
9b=54
b=54:9
b=6
3)5*(3с+2)=8*(9-2с)
15с+10=72-16с
15с+16с=72-10
31с=62
с=62:31
c=2
4)10k+2*(7k-2)=5*(4k+3)+3k
10k+14k-4=20k+15+3k
10k+14k-20k-3k=15+4
1k=19
k=19:1
k=19
0 votes
Thanks 0
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Answers & Comments
разделим все на 3, получим:
5*(а+2)=2*(2а+7)
5а+10=4а+14
5а-4а=14-10
а=4
12b-7*(b+4)=26-4b
12b-7b-28=26-4b
12b-7b+4b=26+28
9b=54
b=6
5*(3c+2)=8*(9-2c)
15c+10=72-16c
15c+16c=72-10
31c=62
c=2
10k+2*(7k-2)=5*(4k+3)+3k
10k+14k-4=20k+15+3k
10k+14k-20k-3k=15+4
k=19
1)15*(a+2)=6*(2a+7)
15a+30=12a+42
15a-12a=42-30
3a=12
a=12:3
a=4
2)12b-7*(b+4)=26-4b
12b-7b+(-28)=26-4b
12b-7b+4b=26+28
9b=54
b=54:9
b=6
3)5*(3с+2)=8*(9-2с)
15с+10=72-16с
15с+16с=72-10
31с=62
с=62:31
c=2
4)10k+2*(7k-2)=5*(4k+3)+3k
10k+14k-4=20k+15+3k
10k+14k-20k-3k=15+4
1k=19
k=19:1
k=19