\(56+44+0+35+65\)

\(=\left(56+44\right)+\left(0+35+65\right)\)

\(=100+100\)

\(=100.2\)

\(=200\)

\(nha^{ }\)

56+44+0+35+65

= ( 56+44)+0+(35+65)

= 100 + 0+100

= 200

50+50+80+20+60+55+44+1+40=400 nha

\(50+50+80+20+60+55+44+1+40\)

\(=\left(50+50\right)+\left(80+20\right)+\left(60+40\right)+\left(55+44+1\right)\)

\(=100+100+100+100\)

\(=100.4\)

\(=400\)

nho gui tin nhan do

5²+5²+5⁵+5

=5⁴+5⁵+5

=5⁹+5

=5¹⁰

\(5^2+5^2+5^5+5\)

\(=5^{2+2+5+1}\)

\(=5^{10}\)

\(=9765625\)

\(nhaaaaaaaaa^{ }\)

A = 1 - 2 + 3 - 4 +...+ 43 - 44 + 45

=> A = (1 - 2) + (3 - 4) +....+ (43 - 44) + 45

=> A = -1 + (-1) +....+ (-1) + 45

=> A = (-1).22 + 45

=> A = -22 + 45

=> A = 23

20 vì :

Khi  - cộng thì 2 số có cùng một tích

Vậy thì ra thôi

Để MM7 là sao em?

Bạn viết rõ đề lại đi bạn.

= 60

k mk nha

60 nha bạn

a) (-30) + 17 + (-70) + 33

=[-30+(-70)]+(17+33)

=-100+50

=-50

b) 56 - 15 - 6 + (-75)

=(56-6)-[15+(-75)]

=50-(-60)

=110

c) (157 - 56) - (44 + 57)

=157-56-44+57

=(-157-57)-(56+44)

=-100-100

=-200

d) (-24 + 174) - (174 - 24)

=-24+174-174+24

=(-24+24)+(174-174)

=0+0

=0

e) (35 - 47) - (-123 + 35) + [20 - (123 - 57)]

=35-47+123-35+[20-123+57]

=35-47+123-35+20-123+57

=(35-35)+(123-123)+(-47+57)

=0+0+(-10)

=-10

Bn sai ở câu e dòng 4

Ta có: \(2020^{45}-2020^{44}\)

\(=2020^{44}\cdot2020-2020^{44}\cdot1\)

\(=2020^{44}\cdot\left(2020-1\right)\)

\(=2020^{44}\cdot2019\)

Ta có: \(2020^{44}-2020^{43}\)

\(=2020^{43}\cdot2020-2020^{43}\cdot1\)

\(=2020^{43}\cdot\left(2020-1\right)\)

\(=2020^{43}\cdot2019\)

Vì \(2020^{44}>2020^{43}\)

nên \(2020^{44}\cdot2019>2020^{43}\cdot2019\)

hay \(2020^{45}-2020^{44}>2020^{44}-2020^{43}\)