a) 

=$\frac{47}{4}$ -($\frac{41}{6}$ - $\frac{9}{2}$ ) + ($\frac{5}{3}$ 

= $\frac{47}{4}$ - ($\frac{41}{6}$ - $\frac{27}{6}$ )+ $\frac{5}{3}$ 

=$\frac{47}{4}$ -$\frac{14}{6}$ +$\frac{5}{3}$ 

=$\frac{141}{12}$ -$\frac{28}{12}$ +$\frac{20}{y12}$ 

=$\frac{133}{12}$ 

b)

=$\frac{30}{7}$ :( $\frac{7}{5}$ -$\frac{31}{7}$) 

= 30/7 : (49/35 -155/35)

= 30/7 :( -106/35)

=75/53

c)

= 47/4 -(41/6 - 9/2 + 5/3)

= 47/4 -(41/6 - 27/6- 10/6)

= 47/4 - 24/6

=141/12 - 48/12

=93/12 

d)

= 5 × 4/3 - 24/5 × 4/3

=20/3 - 96/15

=100/15 - 96/15

=4/15

e)

= -6/35 + ( -3/7 ×(3/5 +1))

= -6/35 + (-3/7 ×8/5)

= -6/35 + (-24/35)

= -30/35

f)

=5/39×( 39/5 × 5/3 + 25/3×39/5)

= 5/39 ×( 39/5 ×(5/3 +25/3))

=5/39× ( 39/5 × 28/3)

=5/39 × 364/5

=28/3

g)

= 57/20 - 26/15+129/20×1/3

=67/60 +43/20

=67/60 +129/60

=196/60

h)

=(29/9×15/23×36/29) × 23/5

=60/23×23/5

=12

i)

=( 47/8-9/4-1/2):75/26

=(47/8-18/8-8/8)×26/75

=21/8×26/75

=91/1000

k)

=8/3×(-4/5)×3/8×(-10)×(-5/8)

=( 8×-4×3×-10×-5)/3×5×8×1×8

=-5

m)

=268/15-24/7-42/15+4

=(268/15 - 42/15)- (24/7+4)

=226/15 - 52/7

=802/105

Phần l) mik ko biết làm , mik chủ tus thông cảm

mong chủ tus chu mik ctlhn , 5* và cam ơn

CHÚC CHỦ TUS HỌC GIỎI !!!!!!!!!!!! <3