Toán 2X+2/4=5/2 35:x+1=8 20X+4:2-5=17 15:5.2+4=10 2X+4:2-5=1 09/09/2021 By Parker 2X+2/4=5/2 35:x+1=8 20X+4:2-5=17 15:5.2+4=10 2X+4:2-5=1
$\text{a) 2x + $\dfrac{2}{4}$=$\dfrac{5}{2}$}$ $\text{⇒ 2x = $\dfrac{5}{2}$ – $\dfrac{2}{4}$}$ $\text{⇒ 2x = $\dfrac{10}{4}$ – $\dfrac{2}{4}$}$ $\text{⇒ 2x = $\dfrac{8}{4}$}$ $\text{⇒ 2x = 2}$ $\text{⇒ x = 1}$ $\text{Vậy x = 1.}$ $\text{b) 35 ÷ x + 1 = 8}$ $\text{⇒ 35 ÷ x = 8 – 1}$ $\text{⇒ 35 ÷ x = 7}$ $\text{⇒ x = 35 ÷ 7}$ $\text{⇒ x = 5}$ $\text{Vậy x = 5.}$ $\text{c) 20x + 4 ÷ 2 – 5 = 17}$ $\text{⇒ 20x + 2 – 5 = 17}$ $\text{⇒ 20x – 3 = 17}$ $\text{⇒ 20x = 17 + 3}$ $\text{⇒ 20x = 20}$ $\text{⇒ x = 1}$ $\text{Vậy x = 1.}$ $\text{d) 15 ÷ 5.2 + 4 = 10}$ $\text{⇒ 3.2 + 4 = 10}$ $\text{⇒ 6 + 4 = 10}$ $\text{e) 2x + 4 ÷ 2 – 5 = 1}$ $\text{⇒ 2x + 2 – 5 = 1}$ $\text{⇒ 2x – 3 = 1}$ $\text{⇒ 2x = 1 + 3}$ $\text{⇒ 2x = 4}$ $\text{⇒ x = 4 ÷ 2}$ $\text{⇒ x = 2}$ $\text{Vậy x = 2.}$ Trả lời
2x+2/4=5/2 ⇒2x = 5/2-2/4 ⇒2x =2 ⇒ x = 2:2 ⇒ x = 1 35:x+1=8 ⇒ 35:x = 8-1 ⇒ 35:x = 7 ⇒ x = 35:7 ⇒ x = 5 20x+4:2-5=17 ⇒ 20x+2-5 =17 ⇒ 20x = 17+5-2 ⇒ 20x = 20 ⇒ x = 20:20 ⇒ x = 1 15:5.2+4=10 ⇒ 3.2+4=10 ⇒ 6+4=10 ⇒ 10=10 (đúng ) 2x+4:2-5=1 ⇒ 2x+2-5=1 ⇒ 2x=1+5-2 ⇒ 2x= 4 ⇒ x = 4:2 ⇒ x = 2 xin hay nhất ạ Trả lời
$\text{a) 2x + $\dfrac{2}{4}$=$\dfrac{5}{2}$}$
$\text{⇒ 2x = $\dfrac{5}{2}$ – $\dfrac{2}{4}$}$
$\text{⇒ 2x = $\dfrac{10}{4}$ – $\dfrac{2}{4}$}$
$\text{⇒ 2x = $\dfrac{8}{4}$}$
$\text{⇒ 2x = 2}$
$\text{⇒ x = 1}$
$\text{Vậy x = 1.}$
$\text{b) 35 ÷ x + 1 = 8}$
$\text{⇒ 35 ÷ x = 8 – 1}$
$\text{⇒ 35 ÷ x = 7}$
$\text{⇒ x = 35 ÷ 7}$
$\text{⇒ x = 5}$
$\text{Vậy x = 5.}$
$\text{c) 20x + 4 ÷ 2 – 5 = 17}$
$\text{⇒ 20x + 2 – 5 = 17}$
$\text{⇒ 20x – 3 = 17}$
$\text{⇒ 20x = 17 + 3}$
$\text{⇒ 20x = 20}$
$\text{⇒ x = 1}$
$\text{Vậy x = 1.}$
$\text{d) 15 ÷ 5.2 + 4 = 10}$
$\text{⇒ 3.2 + 4 = 10}$
$\text{⇒ 6 + 4 = 10}$
$\text{e) 2x + 4 ÷ 2 – 5 = 1}$
$\text{⇒ 2x + 2 – 5 = 1}$
$\text{⇒ 2x – 3 = 1}$
$\text{⇒ 2x = 1 + 3}$
$\text{⇒ 2x = 4}$
$\text{⇒ x = 4 ÷ 2}$
$\text{⇒ x = 2}$
$\text{Vậy x = 2.}$
2x+2/4=5/2
⇒2x = 5/2-2/4
⇒2x =2
⇒ x = 2:2
⇒ x = 1
35:x+1=8
⇒ 35:x = 8-1
⇒ 35:x = 7
⇒ x = 35:7
⇒ x = 5
20x+4:2-5=17
⇒ 20x+2-5 =17
⇒ 20x = 17+5-2
⇒ 20x = 20
⇒ x = 20:20
⇒ x = 1
15:5.2+4=10
⇒ 3.2+4=10
⇒ 6+4=10
⇒ 10=10 (đúng )
2x+4:2-5=1
⇒ 2x+2-5=1
⇒ 2x=1+5-2
⇒ 2x= 4
⇒ x = 4:2
⇒ x = 2
xin hay nhất ạ