=78.(31+24+17)+22.72

=78.72+22.72

=72.(78+22)

=72.100

=7200

l.i.k.e mình nha ngo anh tu

   78 . 31 + 78 . 24 + 78 . 17 + 22 . 72

= 78 . (31 + 24 + 17) + 72 . 22

= 78 . 72 + 72 . 22

= 72 . (78 + 22)

= 72 . 100

= 7200

TL:

   78 . 31 + 78 . 24 + 78 . 17 + 22 . 72

= 78 . (31 + 24 + 17) + 72 . 22

= 78 . 72 + 72 . 22

= 72 . (78 + 22)

= 72 . 100

= 7200

HT

78.31+78.24+78.17+22.72

=78.(31+24+17)+22.72

=78.72+22.72

=72.(78+22)

=72.100

=7200

= 78.(31+24+17)+22.72

= 78.72+22.72

= 72.(78+22)

= 72.100

=7200

7200 là sai đấy mk lm r

78.31+22.72+78.24+78.17

=78.(31+24+17)+22.72

=78.72+22.72

=(78+22).72

=100.72

=7200

78.31+22.72+78.24+78.17

=78.(31+24+17)+22.72

=78.72+22.72

=(78+22).72

=100.72

=7200

78.31+22.72+78.24+78.17

=78.(31+24+17)+22.72

=78.72+22.72

=(78+22).72

=100.72

=7200

b) 78.31 + 78.24 + 78.17 + 72. 22

 = 78. ( 31 + 24 + 17 ) + 72 . 22

= 78 . 72 + 72 . 22

= 72 (78+22)

= 72 . 100 = 7200

b) 78 x 31 + 78 x 24 + 78 x 17 + 72 x 22 

= 78 x ( 31 + 24 + 17 ) + 72 x 22

= 78 x 72 + 72 x 22

= 72 x ( 78 + 22 ) 

= 72 x 100 

= 7200

Ta có: 78.31+78.24+78.17+22.72

= 78.(31 + 24 + 17)  + 22.72

= 78 .72 + 22.72

= 72.(78 + 22)

= 72. 100

= 7200

= 78.(31+24+17)+22.72

= 78.72+22.72

= 72.(78+22)

= 72.100

= 7200

a) 37.75+37.45+63.67+63.53

= 37.(75+45)+63.(67+53)

= 37.120+63.120

= 120.(37+63)

= 120.100

= 12000

b) 35.34+35.86+65.75+65.45

= 35.(34+86)+65.(75+45)

= 35.120+65.120

=120.(35+65)

= 120.100

= 12000

c) 78.31+78.24+78.17+22.72

= 78.(31+24+17)+22.72

= 78.72+22.72

= 72.(78+22)

= 72.100

= 7200

$\mathrm{a)\; 37}.75+37.45+63.67+63.53$

$=37.(75+45)+63.(67+53)$

$=37.120+63.120$

$=(37+63).120$

$=100.120$

$=12000$

b) 35⋅34+35⋅86+65⋅75+65⋅45=35(34+86)+65(75+45)=35⋅120+65⋅120=(35+65)⋅120=100⋅120=12000

c) 78 . 31 + 78 . 24 + 78 . 17 + 22 . 72

= 78 . ( 31 + 24 + 17 ) + 22 . 72

= 78 . 72 + 22 . 72

= 72 . ( 78 + 22 )

= 72 .100

= 7200

chúc bạn học tốt ❤❤❤

$\mathrm{a)\; 37}.75+37.45+63.67+63.53$

$=37.(75+45)+63.(67+53)$

$=37.120+63.120$

$=(37+63).120$

$=100.120$

$=12000$

b) 35 . 34 + 35 . 86 + 65 . 75 + 65 . 45

= 35 . ( 34 + 86 ) + 65 . ( 75 + 45 )

= 35 . 120 + 65 . 120

= ( 35 + 65 ) . 120

= 100 . 120

=12000

c) 78 . 31 + 78 . 24 + 78 . 17 + 22 . 72

= 78 . ( 31 + 24 + 17 ) + 22 . 72

= 78 . 72 + 22 . 72

= 72 . ( 78 + 22 )

= 72 . 100

= 7200

chúc bạn học tốt

C₁ : 78 . 31 + 78 . 24 + 78 . 17 + 22 . 72

= 78 ( 31 + 24 + 17 ) + 22 . 72

= 78 . 72 + 22 . 72

= ( 78 + 22 ) . 72

= 100 . 72

= 7200

C₂ : 78 . 31 + 78 . 24 + 78 . 17 + 22 . 72

= 2418 + 1872 + 1326 + 1584

= 7200

\(78.31+78.24+78.17+22.72.\)

\(=78.\left(31+24+17\right)+22.72\)

\(=78.72+22.72\)

\(=72.\left(78+22\right)\)

\(=72.100=7200\)

C1:

   78.31+78.24+78.17+22.72

= 78.(31+24+17)+22.72

= 78.72+22.72

= 72.(78+22)

=72.100

=7200

C2:

   78.31+78.24+78.17+22.72

= 2418+78.24+78.17+22.72

= 2418+1872+78.17+22.72

= 2418+1872+1326+22.72

=2418+1872+1326+1584

= 4290+1326+1584

= 5616+1584

= 7200

a, -78(31+24+17)+22.72=-78.72+22.72=72.(-78+22)=-4032

b, -15,5.(20,8+9,2)+3,5.(9,2+20,8)=(-15,5+3,5).(20,8+9,2)=-12.30=-360