Question

Tính:

(2/3-1/4+5/11) : (5/12+1-7/11)

Tìm x:

a) 1/4+1/3:3x = 5

b) (x-2/3)^2 = 5/6

Chú ý_ Dấu gạch chéo / :Phần

Answer 1

Ta có : \(\left(\dfrac{2}{3}-\dfrac{1}{4}+\dfrac{5}{11}\right):\left(\dfrac{5}{12}+1-\dfrac{7}{11}\right)\)

= \(\left(\dfrac{88}{132}-\dfrac{33}{132}+\dfrac{60}{132}\right):\left(\dfrac{55}{132}+\dfrac{132}{132}-\dfrac{84}{132}\right)\)

=\(\dfrac{115}{132}:\dfrac{103}{132}\)

=\(\dfrac{115}{132}.\dfrac{132}{103}\)

=\(\dfrac{115}{103}\)

Answer 2

Tìm x

a, \(\dfrac{1}{4}+\dfrac{1}{3}:3x=5\)

\(\Rightarrow\) \(\dfrac{1}{4}+\dfrac{1}{9}x=5\)

\(\Rightarrow\) \(\dfrac{1}{9}x\) \(=5-\dfrac{1}{4}\)

\(\Rightarrow\) \(\dfrac{1}{9}x=\dfrac{20}{4}-\dfrac{1}{4}\)

\(\Rightarrow\) \(\dfrac{1}{9}x=\dfrac{19}{4}\)

\(\Rightarrow\) \(x=\dfrac{19}{4}:\dfrac{1}{9}\)

\(\Rightarrow\) \(x=\dfrac{19}{4}.9\)

\(\Rightarrow\) \(x=\dfrac{171}{4}\)

Vậy \(x=\dfrac{171}{4}\)

Answer 3

(\(\dfrac{2}{3}\)-\(\dfrac{1}{4}\)+\(\dfrac{5}{11}\)) : (\(\dfrac{5}{12}\)+1-\(\dfrac{7}{11}\))

=\(\dfrac{115}{132}\): \(\dfrac{103}{132}\)

=\(\dfrac{115}{103}\)

( Chúc bạn học tốt)