Question

Bài 3: Tìm x, biết: 

b) x x 48 = 490,1 - 125,33

c) 42,75 + x : 5 = 94,5 

d) x - \(\dfrac{3}{4}\)  + \(\dfrac{1}{4}\)  = 3\(\dfrac{1}{3}\)

Answer 1

`@` `\text {Ans}`

`\downarrow`

`b)`

\(x\times48=490,1-125,33\)

\(x\times48=364,77\)

\(x=364,77\div48\)

\(x=7,599375\)

Vậy, `x = 7,599375`

`c)`

\(42,75+x\div5=94,5\)

`x \div 5= 94,5 - 42,75`

`x \div 5 = 51,75`

`x = 51,75 \times 5`

`x = 258,75`

Vậy, `x = 258,75`

`d)`

\(x-\dfrac{3}{4}+\dfrac{1}{4}=3\dfrac{1}{3}\)

\(x-\left(\dfrac{3}{4}-\dfrac{1}{4}\right)=\dfrac{10}{3}\)

\(x-\dfrac{2}{4}=\dfrac{10}{3}\)

\(x=\dfrac{10}{3}+\dfrac{2}{4}\)

\(x=\dfrac{23}{6}\)

Vậy, \(x=\dfrac{23}{6}\)