465 + [(-38) + (-465)] - [12 - (-42)]

= 465 + ( - 38) + ( -465) – 12 – 42      

= [ 465 + (- 465) ] – ( 12 + 42 )       

= 0 – 54 = 0 + ( -54 ) = -54                

a) \(19.43+\left(-20\right).43-\left(-40\right)\)

\(=43.\left(19-20\right)+40\)

\(=-43+40\)

\(=-3\)

b) \(6^7:6^5+3.3^2-2021^0\)

\(=6^2+3^3-1\)

\(=36+27-1\)

\(=62\)

c) \(465+\left[\left(-38\right)+\left(-465\right)\right]-\left[12-\left(-42\right)\right]\)

\(=465-38+\left(-465\right)-12-42\)

\(=-92\)

ai giup mik mik cho 3 hua

a)  − 105 + − 25 + ( − 105 ) + 50  

= 105 + 25 + ( - 105) + 50

= [105 + ( -105)] + ( 25 + 50 )

= 0 + 75 = 75

b)  465 + − 38 + − 465 − 12 − − 42

= 465 + ( - 38) + ( -465) – 12 – 42

= [ 465 + (- 465) ] – ( 12 + 42 )

= 0 – 54 = 0 + ( -54 ) = -54

c)  65. − 19 + − 19 .24 + − 19 .11

= ( - 19) . ( 65 + 24 + 11 )

= ( -19) . 100 = -1900

d)  − 3 2 + 2 3 − − 5 2 + 4 3

= 9 + 8 – 25 + 64 = 56

465+((-38)+(-456))-(12-(-42))

=465+(-494-54)

=465+(-548)

=-83

Phá ngoặc ra rồi gộp vào thích hợp

= 465 - 38 - 465 - 12 - 42

= (465-465) -((38+12)+42)

= 0 - 92

= -92

A, ( - 120 ) - 18 x ( - 5 + 6 )

= ( - 120 ) - 18 x 1

= ( - 120 ) - 18

= - 138

B, 465 + ( - 38 ) + ( - 465 ) + 10 + ( - 42 )

= 0 + ( - 38 ) + 10 + ( - 42 )

= ( - 80 ) + 10

= - 70

=465-38-465+12+420

=(465-465)-38+12+420

= -26+420

=394

a,13

b,16276

c,20

d,20

a) (-17)+5+8+17

=(-17+17)+(5+8)

=0+13

=13

b) (-4)+(-440)6(-6)+440

đề thiếu

c) 465+[58+(-465)+(-38)]

=465+58+(-465)+(-38)

=(-465+465)+(-38+58)

=0+20

=20

d) 465+[58+(-465)+(-38)]

giống bài c