Question

a,2/5+3/4:2

b,1/2x(5/2−3/5)

Bn nào làm nhanh thì mk tick cho nhá :33

Answer 1

\(a,\dfrac{2}{5}+\dfrac{3}{4}:2=\dfrac{2}{5}+\dfrac{3}{8}=\dfrac{16}{40}+\dfrac{15}{40}=\dfrac{31}{40}\)

\(b,\dfrac{1}{2}\times\left(\dfrac{5}{2}-\dfrac{3}{5}\right)=\dfrac{1}{2}\times\dfrac{19}{10}=\dfrac{19}{20}\)

Answer 2

a: =2/5+3/8=16/40+15/40=31/40

b: =1/2x(25/10-6/10)

=1/2x19/10=19/20

Answer 3

a,31/40

b,19/20

Answer 4

a) 2/5+ 3/4 : 2
= 2/5 + 3/8
=   16/40 + 15/40
= 31/40
b) 1/2 x ( 5/2- 3/5)
= 1/2 x ( 25/10 - 6/10)
= 1/2 x      19/10
=    19/20