Vì 9 gấp 3 lần 3 nên suy ra 54 : 3 = 18 Vì 6 x 3 = 18

TL:

54:9=54:3x3=6

=>54:3=6x3=18

HT

TL:

54 : 9 = 54 : 3 x 3 = 6

=> 54 : 3 = 6 x 3 = 18

HT 

a)-32

b)-11

c)2200

A) 220+[4+ (-220)+(-36) = -32

b)(-9)-[(-6)+8] = -11

c)22.154+22.(-54) = 2200

\(\text{a. 220+[4+ (-220)+(-36)}\\ =220+\left[4+-220+-36\right]\\ =220+-252=-32\)

\( b)(-9)-[(-6)+8] \\ =-9+6-8=-11\)

\( c)22.154+22.(-54)\\ =22.\left(154-54\right)\\ =22.100=2200\)

ta có : A=53x107+107-53/53x107+54=53x107+54/53x107+54=1

           B=134x269+269-133/134x269+135=134x269+136/134x269+135>1(vì 136>135)

vậy A<B

k cho mình nhé

Cô làm đ

Bài 1: 

a) 4√24 - 3√54 + 5√6 - √150

= 8√6 - 9√6 + 5√6 - 5√6

= -√6

a: \(=4\cdot2\sqrt{6}-3\cdot3\sqrt{6}+5\sqrt{6}-5\sqrt{6}\)

\(=8\sqrt{6}-9\sqrt{6}=-\sqrt{6}\)

b: \(=2\left(3-2\sqrt{2}\right)-2\left(3+2\sqrt{2}\right)\)

\(=6-4\sqrt{2}-6-4\sqrt{2}=-8\sqrt{2}\)

c: \(=\sqrt{3-\sqrt{5}}-\sqrt{3+\sqrt{5}}\)

\(=\dfrac{\sqrt{6-2\sqrt{5}}-\sqrt{6+2\sqrt{5}}}{\sqrt{2}}\)

\(=\dfrac{\sqrt{5}-1-\sqrt{5}-1}{\sqrt{2}}=-\dfrac{2}{\sqrt{2}}=-\sqrt{2}\)

a: =-3/24-40/24

=-43/24

b: \(=\dfrac{6}{54}\cdot\dfrac{49}{35}=\dfrac{1}{9}\cdot\dfrac{7}{5}=\dfrac{7}{45}\)

c: \(=\dfrac{6}{5}+\dfrac{4}{3}=\dfrac{18+20}{15}=\dfrac{38}{15}\)

d: \(=\dfrac{31}{17}-\dfrac{14}{17}-\dfrac{5}{13}-\dfrac{8}{13}=1-1=0\)

8 − 9 4 + 2 7 − − 6 − 3 7 + 5 4 − 3 + 2 4 − 9 7 = 8 − 9 4 + 2 7 + 6 + 3 7 − 5 4 − 3 − 2 4 + 9 7 = 8 + 6 − 3 − 9 4 − 5 4 − 2 4 + 2 7 + 3 7 + 9 7 = 11 − 4 + 2 = 9