YoVeoAnime
08.07.2019 •
Mathematics
Daca a + b = 20 si b + c = 30 ,calculati 3 . a + 7 . b + 4 . c ( dau coroana la cine ma ajuta )
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Ответ:
It is given that
a+b=20 (1)
b+c=30 (2)
We have to calculate
3 a + 4 b +7 c
Now multiplying equation(1 )by 3,we get
3 a+ 3 b=60 (3)
and Multiplying equation( 2) by 4,we get
4 b + 4 c=120 (4)
Adding expression (3) and (4),we get i.e left hand side of 3 to left hand side of 4 and right hand side of 3 to right hand side of 4.
3 a+ 3 b+ 4 b+ 4 c=60+120
Adding like terms, we get
3 a+ 7 b+ 4 c =180, Which is the required solution.
Ответ:
Im in middle school and im getting college questions wuT
Step-by-step explanation: