=2400

\(3.25.8+4.37.6+2.38.12\\ =\left(3.8\right).25+\left(4.6\right).37+\left(2.12\right).38\\ =24.25+24.37+24.38\\ =24\left(25+37+38\right)\\ =24.100\\ =2400\)

2400👌🏻

a) 17.(-183)+17.83

= 17.(-183+83)

= 17.100=1700

 b) (-27).145+27.45

= 27.(-145)+27.45

= 27.(-145+45)

= 27.100=2700

 c) -38.(25-4)+25.(-4+38)

= -38.25-(-38).4+25.(-4)+25.38

= -38.25+25.38+38.4+25.(-4)

= 0+38.4+(-25).4

= 4.(-25+38)

= 4.13=52

 d) 23.(145-17)-145.(23-37)

= (23.145-23.17)-(145.23+145.37)

= [23.(145-17)]-[145.(23+37)]

= (23.128)-(145.60)

= 2944-8700=-5756

38 x 4 x 60 x 25 x 20 = 4560000

Tk mk nha!

38 x 4 x 60 x 25 x 20 

= 4560000

k mình nha

38 * 4 * 60 * 25 * 20 

= 38 * ( 60 * 20 ) * ( 4 * 25 ) 

= 38 * 1200 * 100 

= 45600 * 100 

= 4560000 

\(3\cdot25\cdot8+4\cdot37\cdot6+2\cdot38\cdot12\)

\(=24\cdot25+24\cdot37+24\cdot38\)

\(=24\left(25+37+38\right)=24\cdot100=2400\)

Tính nhanh 

3 . 25 . 8 + 4 . 37 . 6 + 2 . 38 . 12=2400

3.25.8+4.37.6+2.38.12

=24.25+24.37+24.38

=24(25+37+38)

=24.100

=2400

a) -4.2.6.25.(-7).5

= (2.5).(-4.25).(-7.6)

= 10.(-100).(-42)

= 42000

b) 16.(38 - 2) - 38.(16 - 1)

= 16.38 - 16.2 - 38.16 - 38

= -38 - 38

= -38.2

= -76.

c) Câu này đề không rõ nha.

a)      29 + 132 + 237 + 868 + 763

    =  ( 132 + 868 ) + ( 237 + 763 ) + 29

    = 1000 + 1000 + 29

    =  1000 x 2 + 29

    =  2000 + 29

    =  2029

b)    35 x 34 + 35 x 38 + 65 x 75 + 45

    =  35 x ( 34 + 38 ) + 65 x 75 + 45

    =  35 x 72 + 65 x 75 + 45

    =  2520 + 4875 + 45

    =  2520 + 4920

    =  7440

c)     3 x 25 x 8 + 4 x 37 x 6 + 2 x 38 x 12

    =  ( 3 x 8 ) x 25 + ( 4 x 6 ) x 37 + ( 2 x 12 ) x 38

    =   24 x 25 + 24 x 37 + 24 x 38

    =   24 x ( 25 + 37 + 38 )

    =   24 x 100

    =   2400

a)29+132+237+868+763

=(132+868)+(237+763)+29

=     1000   +   1000    +29

=      2029

a,29+132+237+868+763

=29+(132+868)+(237+763)

=29+1000+1000

=2029

3 x 25 x 8 + 4 x 37 x 6 + 2 x 38 x 12

= (3.8).25 + (4.6).37 + (2.12).38

= 24.25 + 24.37 + 24.38

= 24. ( 25+37+38)

= 24.100

= 2400

\(3.25.8+4.37.6+2.38.12\)

\(=24.25+24.37+24.38\)

\(=24.\left(25+37+38\right)\)

\(=24.100\)

\(=2400\)

Tham khảo nhé~

3 x 25 x 8 + 4 x 37 x 6 + 2 x 38 x 12

=(3.8).25+(4.6).37+(2.12).38

=24.25+24.37+24.38

=24.(25+27+38)

=24.100

=2400

a) 34+35+...+78+79

So so hang cua day tren la:

           (79-34):1+1=46( so )

Tong cua day tren la:

           (79+34)x46:2=2599

                 DS:2599

Câu a bạn @Conan làm rồi

mik làm câu b

\(\text{= 24.25 + 24.37 + 24.38 = 24.(25+37+38) = 24.100 = 2400}\)

giúp mk vs mk đng cần rất gấp!!

b, 23.(145 - 17) - 145. (23 - 6) 

= 145.23 - 17.23 - 145.23 + 145.6

= (145.23 + 145.6) - (145.23 + 17.23)

= 145.(23 + 6) - 23.(145 + 17)

= 145.29 - 23.162

= 479

c, -38. (25 - 4) + 25. (-4 + 38)

= (-38).25 - 4.(-38) + 25. (-4) + 25.38

= [(-38).25 - 4.(-38)] + [25. (-4) + 25.38]

= (-38).(25 - 4) + 25. [(-4) + 38]

= (-38). 21 + 25.34

= - 798 + 850

= 52