Question

Bài 1: Tính : 

a) 2/5 + 7/10 = ………………………………………………..........................  b) 6/7 - 5/8 = …………………………………………………………………… c) 3/5 x 15/8 =…………………………………………………………............  d) 1/4 : 3/7 =…………………………………………………………….............. 

Answer 1

a]11/10 

b]13/56

c]9/8

d]7/12

tick cho mình nha

Answer 2

a,2/5+7/10=11/10 b,6/7-5/8=13/56 c,3/5 x 15/8=9/8 d,1/4:3/7=7/12 HT

Answer 3

bằng 7/12 nha bn

Answer 4

a) \(\dfrac{2}{5}+\dfrac{7}{10}=\dfrac{4}{10}+\dfrac{7}{10}=\dfrac{11}{10}\)

b) \(\dfrac{6}{7}-\dfrac{5}{8}=\dfrac{48}{56}-\dfrac{35}{56}=\dfrac{13}{56}\)

c) \(\dfrac{3}{5}x\dfrac{15}{8}=\dfrac{45}{40}=\dfrac{9}{8}\)

d) \(\dfrac{1}{4}:\dfrac{3}{7}=\dfrac{1}{4}x\dfrac{7}{3}=\dfrac{7}{12}\)