Question

579 nhân y +421 nhân y =2100

Answer 1

\(579\times y+421\times y=2100\\y\times(579+421)=2100\\y\times1000=2100\\y=2100:1000\\y=2,1\)

Answer 2

579 × y + 421 × y = 2100

y × (579 + 421) = 2100

y × 1000 = 2100

y = 2100 : 1000

y = 2,1

Answer 3

\(579\times y+421\times y=2100\)

\(\left(579+421\right)\times y=2100\)

\(1000\times y=2100\)

\(y=2100:1000\)

\(y=2,1\)

Answer 4

579 x y + 421 x y = 2100

( 579 + 421) x y = 2100

1000 x y = 2100

y = 2100 : 1000

y = 2,1