Question

1.50,87 x y + 12,09 x y + 37,04 x y = 256 + 144

2. 7,94 + 24,72 : 12 = y : 2

Answer 1

2: =>y:2=7,94+2,06=10

=>y=20

Answer 2

\(50 , 87 × y + 12 , 09 × y + 37 , 04 × y = 256 + 144\)

\( y × ( 50 , 87 + 12 , 09 + 37 , 04 ) = 400\)

\(y × 100 = 400\)

\(y = 400 : 100 =4\)

Vậy `y=4`

Answer 3

`2` Sửa đề : `y:2=7,94 + 24,72 : 12`

\(y : 2 = 7 , 94 + 27 , 12 : 12\)

\(y : 2 = 7 , 94 + 2 , 06\)

\(y : 2 = 10\)

\(y = 10 × 2\)

`y=20`