Question

1 . tính bằng hai cách

3/4 x 1/2 x 2        

Cách 1 :  ....................................................................................

Cách 2 : .....................................................................................

( 3/4+1/2 ) x 5/7

Cách 1 :  ....................................................................................

Cách 2 :  ....................................................................................

5/7 x 13/21 + 2/7 x 13/21

Cách 1 :  ....................................................................................

Cách 2 :  ....................................................................................

7/5 + 4/3 + 7/5 + 4/3

Cách 1 :  ....................................................................................

Cách 2 :  ....................................................................................

Answer 1

a) Cách 1

\(\frac{3}{4}\)x \(\frac{1}{2}\)x \(2\)

= \(\frac{3}{8}\)x \(2\)

= \(\frac{3}{4}\)

Cách 2

\(\frac{3}{4}\)x \(\frac{1}{2}\)x \(2\)

= \(\frac{3}{4}\)x \(\left(\frac{1}{2}x2\right)\)

= \(\frac{3}{4}\)x 1

= \(\frac{3}{4}\)