\(\dfrac{x-130}{20}\)+\(\dfrac{x-100}{25}\)+\(\dfrac{x-60}{30}\)+\(\dfrac{x-10}{35}\)=10

⇔\(\dfrac{2625\left(x-130\right)}{52500}\)+\(\dfrac{2100\left(x-100\right)}{52500}\)+\(\dfrac{1750\left(x-60\right)}{52500}\)+\(\dfrac{1500\left(x-10\right)}{52500}\)=\(\dfrac{525000}{52500}\)

⇔2625\(x\)-341250+2100\(x\)-210000+1750\(x\)-105000+1500\(x\)-15000=525000

⇔ 7975\(x\) = 1196250

⇔ \(x\) = \(\dfrac{1196250}{7975}\)

⇔\(x \) = 150

\(\left(\dfrac{15}{10}x+25\right):\dfrac{2}{3}=60\)

\(\dfrac{15}{10}x+25=40\)

\(\dfrac{15}{10}x=15\)

\(\Rightarrow x=10\)

Vậy \(x=10\)

(\(\dfrac{15}{10}\)x + 25) : \(\dfrac{2}{3}\) = 60

(\(\dfrac{3}{2}\)x + 25) : \(\dfrac{2}{3}\) = 60

\(\dfrac{3}{2}\)x + 25 = 60 . \(\dfrac{2}{3}\)

\(\dfrac{3}{2}\)x + 25 = \(\dfrac{120}{3}\)

\(\dfrac{3}{2}\)x + 25 = 40

\(\dfrac{3}{2}\)x = 40 - 25

\(\dfrac{3}{2}\)x = 15

x = 15 : \(\dfrac{3}{2}\)

x = 15 . \(\dfrac{2}{3}\)

x = \(\dfrac{15.2}{3}\)

x = \(\dfrac{30}{3}\)

x = 10

Vậy x = 10

a: \(x\in\varnothing\)

=>15/10x+25=60.2/3

=>15/10x+25=40

=>15/10x=40-25

=>15/10x=15

=>x=15.10/15

=>x=10

vậy x=10

15/10x+25=40

15/10x=15

x=15:15/10

x=10

\(\left(\frac{15}{10}x+25\right):\frac{2}{3}=60\)

\(\Rightarrow\frac{15}{10}x+25=60\cdot\frac{2}{3}\)

\(\Rightarrow\frac{10}{15}x+25=40\)

\(\Rightarrow\frac{10}{15}x=40-25\)

\(\Rightarrow\frac{10}{15}x=15\)

\(\Rightarrow x=15:\frac{10}{15}\)

\(\Rightarrow x=\frac{45}{2}\)

A) 9

Yêu cầu, gợi ý các bạn khác chọn (k) đúng cho mình

A) 75 : 25 = ( 75 : 5 ) : ( 25 : 5 ) = 15 : 5 = 3

B) 90 : 18 = ( 90 : 18 ) : ( 18 : 18 ) = 5 : 1 = 5

A) vì hai số đều chia hết cho 5 cho nên lấy hai số chia 5 ra kết quả bao nhiêu thì lấy hai số đó chia cho nhau

B) vì hai số đều chia hết cho 18 cho nên lấy hai số chia 18 ra kêt quả bao nhiêu thì lấy hai số chia cho nhau
 

a,  70 - 5 ( x - 3 ) = 45

⇔ 5 . x - 3 = 70 - 45

⇔ 5 x - 3 = 35

⇔ x - 3 = 35 : 5 ⇔ x - 3 = 7

⇔ x = 10

b,  10 + 2 x = 4 5 : 4 3

⇔ 10 + 2 x = 4 2 ⇔ 10 + 2 x = 16

⇔ 2 x = 4 ⇔ x = 2

c,  60 - 3 x - 2 = 51

⇔ 3 x - 2 = 60 - 51

⇔ 3 x - 2 = 9

⇔ x - 2 = 3 ⇔ x = 5

d,  4 x - 20 = 2 5 : 2 3

⇔ 4 x - 20 = 2 2 ⇔ 4 x - 20 = 4

⇔ 4 x = 24 ⇔ x = 6