Toán tìm y {y-24}:28=20 13 nhân {y-6}=4 nhân y-6 14/09/2021 By Rose tìm y {y-24}:28=20 13 nhân {y-6}=4 nhân y-6
(y-24):28=20 y-24=20.28 y-24=560 y=560+24 y=584 —————- 13.(y-6)=4.y-6 13.y-13.6=4.y-6 13.y-78=4.y-6 13.y-78+78=4.y-6+78 13.y=4.y+72 13.y-4.y=4.y+72-4.y 9y=72 y=72:9 y=8 Trả lời
`1)(y-24):28=20` `y-24=20 × 28` `y-24=560` `y=560+24``y=584.` `2)13 × (y-6)=4×y-6` `13×y-13×6=4×y-6` `13×y-13×6-4×y+6=0` `13×y-4×y-78+6=0` `y×(13-4)-72=0` `y×9-72=0` `y×9=72` `y=72:9` `y=8` `y=8.` Trả lời
(y-24):28=20
y-24=20.28
y-24=560
y=560+24
y=584
—————-
13.(y-6)=4.y-6
13.y-13.6=4.y-6
13.y-78=4.y-6
13.y-78+78=4.y-6+78
13.y=4.y+72
13.y-4.y=4.y+72-4.y
9y=72
y=72:9
y=8
`1)(y-24):28=20`
`y-24=20 × 28`
`y-24=560`
`y=560+24`
`y=584.`
`2)13 × (y-6)=4×y-6`
`13×y-13×6=4×y-6`
`13×y-13×6-4×y+6=0`
`13×y-4×y-78+6=0`
`y×(13-4)-72=0`
`y×9-72=0`
`y×9=72`
`y=72:9`
`y=8`
`y=8.`