Question

tính bằng cách thuận thiện  (vd :6 4/3  hỗn số 6 và 4 phần 3 )
15 1/3 x 2/7 + 15 1/3 x 5/7 
 

Answer 1

\(15\dfrac{1}{3}\times\dfrac{2}{7}+15\dfrac{1}{3}\times\dfrac{5}{7}\\ =\dfrac{46}{3}\times\left(\dfrac{2}{7}+\dfrac{5}{7}\right)\\ =\dfrac{46}{3}\times1\\ =\dfrac{46}{3}\)

Answer 2

`15 1/3 xx 2/7 + 15 1/3 xx 5/7`

 

`= 46/3 xx ( 2/7 + 5/7 )`

 

`= 46/3 xx 1 = 46/3`

Answer 3

\(15\dfrac{1}{3}\times\dfrac{2}{7}+15\dfrac{1}{3}\times\dfrac{5}{7}\)

\(=15\dfrac{1}{3}\times\left(\dfrac{2}{7}+\dfrac{5}{7}\right)\)

\(=15\dfrac{1}{3}\times\dfrac{7}{7}\)

\(=\dfrac{46}{3}\times1\)

\(=\dfrac{46}{3}\)