Предмет: Математика, автор: btursunbekov328

помогите сделать номер 2(а,б) кыдыралиев

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Ответы

Автор ответа: monikaddlccccc

0

a)

a+b= 42

2a + 18b = 420

a+b= 42

b=42 - a

b=42 -a

2+18b=420

2a + 18(42-a)=420

756-16a=420

-16a= -336

(-1)16a/-16 = 336/ -16

a=21

b=42-a

b=42-21

b=21

b=21

a=21

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