a: 3/5>1/2

b: 5/6<7/8

c: 8/9<7/6

d: 9/4<7/3

e: 8/12=2/3

f: 77/99=7/9

\(\dfrac{3}{5}>\dfrac{1}{2}\)

\(\dfrac{5}{6}< \dfrac{7}{8}\)

\(\dfrac{8}{9}< \dfrac{7}{6}\)

\(\dfrac{9}{4}< \dfrac{7}{3}\)

\(\dfrac{8}{12}=\dfrac{2}{3}\)

\(\dfrac{77}{99}=\dfrac{7}{9}\)

  \(\dfrac{1}{2}+\dfrac{3}{4}-\left(\dfrac{3}{4}-\dfrac{4}{5}\right)\)

=\(\dfrac{1}{2}+\dfrac{3}{4}-\dfrac{3}{4}+\dfrac{4}{5}\)

=\(\left(\dfrac{1}{2}+\dfrac{4}{5}\right)+\left(\dfrac{3}{4}-\dfrac{3}{4}\right)\) 

=\(\left(\dfrac{5}{10}+\dfrac{8}{10}\right)+0\)

=\(\dfrac{13}{10}\)

\(-\dfrac{7}{25}.\dfrac{11}{13}+\left(-\dfrac{7}{25}\right).\dfrac{2}{13}-\dfrac{18}{25}\)

=\(-\dfrac{7}{25}.\cdot\left(\dfrac{11}{13}+\dfrac{2}{13}\right)-\dfrac{18}{25}\) 

=\(-\dfrac{7}{25}.1-\dfrac{18}{25}\) 

=\(-\dfrac{7}{25}-\dfrac{18}{25}\) 

=\(-\dfrac{25}{25}\) = \(-1\)

\(\frac{12}{15}\)+  \(\frac{4}{5}\)= \(\frac{8}{5}\)

a) 3/5x7/8:10/9=21/40:10/9=189/400

b) 3 2/7x2 1/4:1 2/5=23/7x9/4:7/5=207/28:7/5=1035/196

c) 6/9+24/15+12/9+6/15=34/15+12/9+6/15=18/5+6/15=4

d) 3 2/9-( 1 5/8+1 2/9 )=29/9-(13/8+11/9)=29/9-205/72=3/8

tinh

a)  3/5 x 7/8 : 10/9

b) 3 2/7 x 2 1/4 : 1 2/5

c) 6/9 + 24/15 + 12/9 + 6/15

bạn nào giải  thích rõ ràng  ba k sẽ thụôc về bạn

a) -4/9 * 7/15 + 4/-9 * 8/15

= -4/9 * 7/15 + -4/9 * 8/15 ( 4/-9 = -4/9 )

= -4/9 * ( 7/15 + 8/15 )

= -4/9 * 1 = -4/9

b) 5/-4 * 16/25 + (-5/4) * 9/25

= -5/4 * 16/25 + -5/4 * 9/25 ( 5/-4 = -5/4 )

= -5/4 * ( 16/25 + 9/25 )
= -5/4 * 1 = -5/4

c) 4 11/23 chắc chắn là hỗn số rồi

Câu c) để sau

• 50 + 50 + 50 = 150
• 569 + 89 + 90  = 748
• 12 + 12 = 24 
• 78 + 78 = 156 
• 4 + 7 = 11
• 6 + 8 = 14
• 9 + 0 = 9 
• 56 - 43 = 13 

50+50+50

=150

569+89+90

= Bao nhiêu í mik chưa tính

12 + 12

=24

78+78

=  156

4+7

=11

6+8

=14

9+0

=9

56-43

=  13

a) 18*76+24*18-150=