Question

Bài 10:

a) 1/3x3/4+5/4x1/3=

b) Tìm một số tự nhiên biết 3/5 số đó bằng 60

Answer 1

a \(\dfrac{1}{3}\cdot\left(\dfrac{3}{4}+\dfrac{5}{4}\right)=\dfrac{1}{3}\cdot\dfrac{8}{4}=\dfrac{1}{3}\cdot2=\dfrac{2}{3}\)

b 100

Answer 2

a) \(\dfrac{1}{3}\times\dfrac{3}{4}+\dfrac{5}{4}\times\dfrac{1}{3}=\dfrac{1}{3}\times\left(\dfrac{3}{4}+\dfrac{5}{4}\right)=\dfrac{1}{3}\times2=\dfrac{2}{3}\)

b) 100

Answer 3

a) 1/3x3/4+5/4x1/3=3/12+5/12=8/12=2/3

b) Tìm một số tự nhiên biết 3/5 số đó bằng 60

=>60:3/5=60x5/3=100

Answer 4

a) ^{_{\(\dfrac{1}{3}\times\dfrac{3}{4}+\dfrac{5}{4}\times\dfrac{1}{3}\)}}

^{_{\(=\dfrac{1}{3}\times\left(\dfrac{3}{4}+\dfrac{5}{4}\right)\)}}

^{_{\(=\dfrac{1}{3}\times2\)}}

^{_{\(=\dfrac{2}{3}\)}}

b) Số đó là: \(60:3\times5=100\)

Answer 5

a)2/3

b)60^3/5=36

 

Answer 6

a,\(\dfrac{3}{12}\) + \(\dfrac{5}{12}\) = \(\dfrac{8}{12}\) = \(\dfrac{2}{3}\) 

b,100

 

Answer 7

\(a,\dfrac{1}{3}\times\dfrac{3}{4}+\dfrac{5}{4}\times\dfrac{1}{3}=\dfrac{3}{12}+\dfrac{5}{12}=\dfrac{8}{12}=\dfrac{2}{3}\)

\(b,60:\dfrac{3}{5}=60\times\dfrac{5}{3}=\dfrac{300}{3}=100\)

Vậy số đó là \(100\)