Математика, вопрос задал shvachukteresa , 1 год назад

1)(x+12/21)+6/21=5/21
2)17/30-(x-5/30)=15/30
Допоможіть будь ласка

Ответы на вопрос

Ответил qrwueoxnm
1
1) (x + 12/21) + 6/21 = 5/21
x + 12/21 = 5/21 - 6/21
x + 12/21 = -1/21
x = -1/21 - 12/21
x = -13/21

2) 17/30 - (x - 5/30) = 15/30
17/30 - x + 5/30 = 15/30
17/30 + 5/30 - x = 15/30
22/30 - x = 15/30
-x = 15/30 - 22/30
-x = -7/30
x = 7/30
Ответил aedpekl
1

1)(x +  \frac{12}{21} ) +  \frac{6}{21}  =  \frac{5}{21}

x +  \frac{12}{21}  =  \frac{5}{21}  -  \frac{6}{21}

x +  \frac{12}{21}  =  -  \frac{1}{21}

x =  -  \frac{1}{21}  -  \frac{12}{21}

x =  -  \frac{13}{21}

2) \frac{17}{30}  - (x -  \frac{5}{30} ) =  \frac{15}{30}

 - x  +   \frac{5}{30}  =  \frac{15}{30}  -  \frac{17}{30}

 - x  +   \frac{5}{30}  =  -  \frac{2}{30}

 - x =  -  \frac{2}{30}   -   \frac{5}{30}

 - x =  -  \frac{7}{30}

x =  \frac{7}{30}

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