a)17-(12+13)

=17-25

=-8

b)2347-450-347-550

=(2347-347)-(450+550)

=2000-1000

=1000

c)(-71).(-175)-75.71

=71.(175-75)

=71.100

=7100

d)93.(27-100)+(-3)^3.93

=93.(27-100)+(-27).93

=93.((-27)+(-73))

=93.(-100)

=-9300

bài 2 :

a)x-15=-20

        x=-20+15

        x=-5 

b)3x+27=6

 3x=6-27

 3x=-21

    x=-21:3

    x=-7

c)3.(x-1)+27=102

  3.(x-1)=102-27

 3.(x-1)=75

   x-1=75:3

   x-1=25

     x=25+1

    x=26

d)|x-6|.7-(-2)^2=-8+39 

sory ,câu này mk ko làm đc  

a)\(\left(-3\right).8.\left(-2\right).5=\left(-3\right).\left(-2\right).8.5\)

                                          \(=6.40=240\)

b)\(127-18.\left(5+6\right)=127-18.11\)

                                             \(=127-198=-71\)

c)\(125-\left(-75\right)+32-\left(48+32\right)=125+75+32-48-32\)

                                                                              \(\left(125+75\right)+\left(32-32\right)-48=200-48=152\)

d)\(3.\left(-4\right).2+2.\left(-5\right)-20=-12.2+2.\left(-5\right)-20\)

                                                             \(=\left(-12-5\right).2-20=-17.2-20=-140-20=-160\)

Chúc bạn học tốt

a) 4

b) 80

c) 243

d) 9

bạn tự giải ra nhé!mk làm tắt thui

c. 2¹⁵. 9⁴/ 6⁶. 8³ = 2¹⁵. (3²)⁴/( 2.3 )⁶. (2³)³

                         = 2¹⁵. 3⁸/ 2⁶.3⁶.2⁹

                         = 3²=9

a) (0.8)^5:(0,4)^6

   =(0,4)^10:(0,4)^6

   = (0,4)^4

b)  (0,125)^3*512

   = 1

c)45^10*5^20/75^15

=243

d) 2^15*9^4/6^6*8^3

=2359296

nhận đúng cho mk nha

\(y:5\times6=985+532\\ \Rightarrow y:5\times6=1517\\ \Rightarrow y:5=1517:6\\ \Rightarrow y:5=\dfrac{1517}{6}\\ \Rightarrow y=\dfrac{1517}{6}\times5\\ \Rightarrow y=\dfrac{7585}{6}\)

45^10*5^20/75^15

=5^10*9^10*5^20/(5^2)^15

=5^10*5^20*9^10/5^30

=9^10

(0.8)^5/(0.4)^6

=(0.4)^5*2^5/(0.4)^6

=2^5/(0.4)

=32/(0.4)

=80

2^15*9^4/6^6*8^3

=2^15*(3^2)^4/2^6*3^6*(2^3)^3

=2^15*3^8/2^6*3^6*2^9

=3^2

=9

a) (38 - 60) + (20 - 38)

= 38 - 60 + 20 - 38

= (38 - 38) + (-60 + 20)

= 0 - 40

= -40

b) 75 - (20 + 75)

= 75 - 20 - 75

= (75 - 75) - 20

= 0 - 20

= -20

c) 32 + (60 - 32)

= 32 + 60 - 32

= (32 - 32) + 60

= 0 + 60

= 60

d) (81 - 36) - (81 - 36)

= 81 - 36 - 81 + 36

= (81 - 81) + (-36 + 36)

= 0 + 0

= 0

e) (2 + 4 + 6 + 8) - (1 + 3 + 5 + 7)

= 2 + 4 + 6 + 8 - 1 - 3 - 5 - 7

= (2 - 1) + (4 - 3) + (6 - 5) + (8 - 7)

= 1 + 1 + 1 + 1

= 4

f) (1 + 3 + 5 + 7 + ... + 99) - (2 + 4 + 6 + 8 + ... + 100)

= 1 + 3 + 5 + 7 + ... + 99 - 2 - 4 - 6 - 8 - ... - 100

= (1 - 2) + (3 - 4) + (5 - 6) + (7 - 8) + ... + (99 - 100)

= -1 - 1 - 1 - 1 - ... - 1 (50 chữ số 1)

= -50

giúp mình với huhuhuhuhuhu

cảm ơn bạn nhiều !!!!!!!!!✿❤☺

a/  45¹⁰ . 5²⁰ / 75¹⁵ = (3².5)¹⁰.5²⁰/ (3.5²)¹⁵ = 3²⁰.5³⁰/ 3¹⁵.5³⁰ = 3⁵=243

b/ 2¹⁵. 9⁴ / 6⁶. 8³ = 2¹⁵.3⁸/ 2⁶.3⁶.2⁹ = 3² = 9