3.25.8 + 4.37.6 + 2.3812 - 24.25 + 24.37 + 24.38

= 24.(25 + 37 + 38) = 2400

3*25*8+4*37*6+2*38*12=24*25+24*37+24*38=24*(25+37+38)=24*100=2400

3.25.8+4.6.37+2.38.12

<=> 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.(25+37+38)

=24.100

=2400

chúc bạn học tốt :)!

3.25.8+4.37.6+2.38.12 

=24.25+24.37+24.38

=24.(25+37+38)

=24.100=2400

mik nha

Biết làm câu b 

=24.25+24.37+24.38

=24.(25+24+38)

=24.87

=2088

cau a là

29 + 135 + 234 + 865 + 766

=(135 + 865) + ( 234 + 766) + 29

= 1000 + 1000 + 29

= 2000 + 29

= 2029

câu b

3.25.8 + 4.37.6 + 2.38.12

= 3.8.25 + 4.6.37 + 2.12.38

=24.25 + 24.37 + 24.38

=24.(25+27+38)

=24.87

=2088

\(a.3.125.121.8\) 

\(=375.121.8\)

\(=45375.8\)

\(=363000\) 

\(b.37.64+37.36\) 

\(=37.\left(64+36\right)\) 

\(=37.100=3700\) 

\(c.3.25.8+4.37.6+2.38.12\) 

\(=600+888+912=2400\) 

câu d là j e ghi rõ cho cj nha

a) 23.56 + 56.77 = (23 + 77).56 = 100.56 = 5600.

b) 32.19 + 32 = 32.(19 +1) = 32.20 = 640.

c) 35.34 + 35.86 + 65.75 + 65.45 = 35.(34 + 86) + 65.(75 + 45)

= 120.35+120.65 -120.(35 + 65) = 12000.

d) 43.17 + 29.57 +13.43 + 57 = 43.(17 +13) + 57.(29 +1)

= 43.30 + 57.30 = 30. (43+57) = 3000.

e) 3.25.8 + 4.37.6 + 2.3812 - 24.25 + 24.37 + 24.38

= 24.(25 + 37 + 38) = 2400.

f) 64.16 + 81.84+17.16 = 16.(64+17)+81.84 = 16.81+81.84

= 81.(16 + 84) = 8100

a) 23.56 + 56.77 = (23 + 77).56 = 100.56 = 5600.

b) 32.19 + 32 = 32.(19 +1) = 32.20 = 640.

c) 35.34 + 35.86 + 65.75 + 65.45 = 35.(34 + 86) + 65.(75 + 45)

= 120.35+120.65 -120.(35 + 65) = 12000.

d) 43.17 + 29.57 +13.43 + 57 = 43.(17 +13) + 57.(29 +1)

= 43.30 + 57.30 = 30. (43+57) = 3000.

e) 3.25.8 + 4.37.6 + 2.3812 - 24.25 + 24.37 + 24.38

= 24.(25 + 37 + 38) = 2400.

f) 64.16 + 81.84+17.16 = 16.(64+17)+81.84 = 16.81+81.84

= 81.(16 + 84) = 8100

a: =274+184=458

b: =29+132+868+237+163

=1000+400+29

=1429

f: =A*135*137(1001-1001)=0

e: =24*25+24*37+24*38

=24*100=2400

c: =31(98+2)=31*100=3100