tìm x : $\frac{3}{4}$ : $\frac{x}{6}$ =0.76 2.5 x $\frac{45}{x}$=$\frac{5}{6}$ 7.75-(0.5 ×X ÷5-6.2)=5 x ×150-x ×75=300 19/10/2021 Bởi Arianna tìm x : $\frac{3}{4}$ : $\frac{x}{6}$ =0.76 2.5 x $\frac{45}{x}$=$\frac{5}{6}$ 7.75-(0.5 ×X ÷5-6.2)=5 x ×150-x ×75=300
Giải : `3/4 : x/6 = 0,76` `→ 3/4 : x/6 = 19/25` `→ x/6 = 3/4 : 19/25` `→ x/6 = 75/76` `→ 76 . x = 75 . 6` `→ 76 . x = 450` `→ x = 450/76 = 225/38` Vậy `x = 225/38` —————————— ` 2,5 . 45/x = 5/6` `→ 45/x = 5/6 : 5/2` `→ 45/x = 1/3` `→ x = 45 . 3` `→ x =135` Vậy `x = 135` ——————————- ` 7,75 – ( 0,5 . x : 5 – 6,2 ) = 5 ` `→ 0,5 . x : 5 – 6,2 = 7,75 – 5` `→ 0,5 . x : 5 = 2,75 + 6,2` `→ 0,5 . x = 8,95 . 5` `→ x = 44,75 : 0,5` `→ x = 89,5` Vậy `x = 89,5` —————————— $x . 150 – x . 75 = 300^{}$ `→ x . ( 150 – 75 ) = 300` `→ x . 75 = 300` `→ x = 300 : 75` `→ x = 4` Vậy `x = 4` —————————— XIN HAY NHẤT AK Bình luận
Đáp án + Các bước giải : `3/4 : x/6 = 0,76` `⇒ 3/4 : x/6 = 19/25` `⇒ x/6 = 3/4 : 19/25` `⇒ x/6 = 75/76` `⇒ 76 . x = 75 . 6` `⇒ 76 . x = 450` `⇒ x = 450/76 = 225/38` Vậy `x = 225/38` ============= ` 2,5 . 45/x = 5/6` `⇒ 45/x = 5/6 : 5/2` `⇒ 45/x = 1/3` `⇒ x = 45 . 3` `⇒ x =135` Vậy `x = 135` ================== ` 7,75 – ( 0,5 . x : 5 – 6,2 ) = 5 ` `⇒ 0,5 . x : 5 – 6,2 = 7,75 – 5` `⇒ 0,5 . x : 5 = 2,75 + 6,2` `⇒ 0,5 . x = 8,95 . 5` `⇒ x = 44,75 : 0,5` `⇒ x = 89,5` Vậy `x = 89,5` ================= $x . 150 – x . 75 = 300^{}$ `⇒ x . ( 150 – 75 ) = 300` `⇒ x . 75 = 300` `→ x = 300 : 75` `⇒ x = 4` Vậy `x = 4` ============== NHƯỜNG BN KIA HAY NHẤT AK Bình luận
Giải :
`3/4 : x/6 = 0,76`
`→ 3/4 : x/6 = 19/25`
`→ x/6 = 3/4 : 19/25`
`→ x/6 = 75/76`
`→ 76 . x = 75 . 6`
`→ 76 . x = 450`
`→ x = 450/76 = 225/38`
Vậy `x = 225/38`
——————————
` 2,5 . 45/x = 5/6`
`→ 45/x = 5/6 : 5/2`
`→ 45/x = 1/3`
`→ x = 45 . 3`
`→ x =135`
Vậy `x = 135`
——————————-
` 7,75 – ( 0,5 . x : 5 – 6,2 ) = 5 `
`→ 0,5 . x : 5 – 6,2 = 7,75 – 5`
`→ 0,5 . x : 5 = 2,75 + 6,2`
`→ 0,5 . x = 8,95 . 5`
`→ x = 44,75 : 0,5`
`→ x = 89,5`
Vậy `x = 89,5`
——————————
$x . 150 – x . 75 = 300^{}$
`→ x . ( 150 – 75 ) = 300`
`→ x . 75 = 300`
`→ x = 300 : 75`
`→ x = 4`
Vậy `x = 4`
——————————
XIN HAY NHẤT AK
Đáp án + Các bước giải :
`3/4 : x/6 = 0,76`
`⇒ 3/4 : x/6 = 19/25`
`⇒ x/6 = 3/4 : 19/25`
`⇒ x/6 = 75/76`
`⇒ 76 . x = 75 . 6`
`⇒ 76 . x = 450`
`⇒ x = 450/76 = 225/38`
Vậy `x = 225/38`
=============
` 2,5 . 45/x = 5/6`
`⇒ 45/x = 5/6 : 5/2`
`⇒ 45/x = 1/3`
`⇒ x = 45 . 3`
`⇒ x =135`
Vậy `x = 135`
==================
` 7,75 – ( 0,5 . x : 5 – 6,2 ) = 5 `
`⇒ 0,5 . x : 5 – 6,2 = 7,75 – 5`
`⇒ 0,5 . x : 5 = 2,75 + 6,2`
`⇒ 0,5 . x = 8,95 . 5`
`⇒ x = 44,75 : 0,5`
`⇒ x = 89,5`
Vậy `x = 89,5`
=================
$x . 150 – x . 75 = 300^{}$
`⇒ x . ( 150 – 75 ) = 300`
`⇒ x . 75 = 300`
`→ x = 300 : 75`
`⇒ x = 4`
Vậy `x = 4`
==============
NHƯỜNG BN KIA HAY NHẤT AK