lams172520 lams172520

08-08-2021
Mathematics

contestada

Tìm các chữ số a, b , c biết a/-5=b/-7=c/2 và a-b+c=-28

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surjithayer10otahza surjithayer10otahza

08-08-2021

Answer:

a=35,b=49,c=-14

Step-by-step explanation:

[tex]\frac{a}{-5} =\frac{b}{-7} =\frac{c}{2} =r(say)\\a=-5r,b=-7r,c=2r\\a-b+c=-5r+7r+2r=4r=-28\\r=\frac{-28}{4}=-7\\a=-5 \times -7=35\\b=-7 \times -7=49\\c=2 \times -7=-14[/tex]

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