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
