Question

Bỏ ngoặc rồi rính :

a) 20-(-40) +10

 b) -21+(-13)-4

c) (3-23) - (4-10)

d) (-8+15)-(-6-20)

Answer 1

\(\text{a) }20-\left(-40\right)+10=20+40+10=60+10=70\)

\(\text{b) }-21+\left(-13\right)-4=-25-13-4=-38-4=-42\)

\(\text{c) }\left(3-23\right)-\left(4-10\right)=3-23-4+10=-20+6=-14\)

\(\text{d) }\left(-8+15\right)-\left(-6-20\right)=-8+15+6+20=-8+41=33\)

Answer 2

a) 20 - (-40) + 10

= 20 + 40 + 10

= 60 + 10

= 70

Answer 3

b) -21 + (-13) - 4

= -21 - 13 - 4

= -34 - 4

= -38

Answer 4

c) ( 3 - 23 ) - ( 4 - 10 )

= 3 - 23 - 4 + 10

= -20 + 6

= -14

Answer 5

d) ( -8 + 15 ) - ( -6 - 20 )

= -8 + 15 + 6 + 20

= 7 + 26

= 33

Answer 6

sao từ -21 thành -25 vậy