35.34+35.86+65.75+65.45

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

=35.120+65.120

=(35+65).120

=100.120

=12000

35.34+35.86+65.75+65.45

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

=35.120+65.120

=(35+65).120

=100.120

=12000

a) 35.34 + 35.86 + 65.75 + 65.45 =

( 35 + 65 ) x ( 34 + 86 ) + ( 75 + 45 )

100 x 120 x 120

100 x 14400

1440000

\(35\cdot34+35\cdot86+65\cdot75+65\cdot45\\ =35\cdot\left(34+86\right)+65\cdot\left(75+45\right)\\ =35\cdot120+65\cdot120\\ =120\cdot\left(35+65\right)\\ =120\cdot100\\ =12000\)

A,35*34+35*86+65*75+65*45

=35*[34+86]+65*[75+45]

=35*100+65*120

=35*100+65*100+65*20

=[35+65]*100+65*20

=10000+1300=11300

a) 35× 34 +35× 86 + 65 × 75 + 65× 45

= 35× ( 34+86) + 65× (75 + 45)

= 35× 120 + 65 × 120

= 120 × ( 35 + 65)

= 120 × 100 = 12000

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

a, 35.34 + 35.86 + 65.75 + 65.45

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

= 35.120 + 65.120

= 120.(35+65)

= 120.100

= 12000

b, \(7.5^2-32:2^3+9\)

= 7.25 - 32:8 + 9

= 175 - 4 + 9

= 180

a) 35.34 + 35.86 + 65.75 + 65.45

= 35. ( 34 + 86 ) + 65 . ( 75 + 25 ) 

= 35 . 120 + 65 . 100

= 4200 + 6500

= 10700

b) 21.49 - 11.49 + 90.49 + 49.125.16

= 49 . ( 21-11+90) +49 .125.8.2

= 49 .100 + 49 .1000 .2

= 4900 + 49000 .2

= 4900 + 98000

= 102900

Hên xui nhé !!!

Bạn Bích Trâm sai đề bài câu a rùi

Đáp án đúg là 12480

35.34+35.86+65.75+65.45=35.(34+86)+65.(75+45)=35.120+65.120=100.120=12000

a)

\(\Rightarrow35.\left(34+86\right)+65.\left(75+45\right)\)

\(\Rightarrow35.120+65.120\)

\(\Rightarrow120.\left(35+65\right)=120.100=12000\)

b)

\(\Leftrightarrow21.49-11.49+90.49+49.125.16\)

\(\Rightarrow49.\left(21-11+90+2000\right)\)

\(\Rightarrow49.2100=102900\)

a) 35 . 34 + 35 . 86 + 65 . 75 + 65 . 45
= 35 . ( 34 + 86 ) + 65 . ( 75 + 45 )
= 35 . 120 + 65 . 120
= ( 35 + 65 ) . 120
= 100 . 120
= 12000

b) 21 . 7² - 11 . 7² + 90 . 7² + 49 . 125 . 16
= 21 . 49 - 11 . 49 + 90 . 49 + 49 . 125 . 16
= ( 21 - 11 + 90 ) . 49 + 49 . 125 . 8 . 2
= 100 . 49 + 49 . 2 . 1000
= 100 . 49 + 49 . 2000
= ( 100 + 2000 ) . 49
= 2100 . 49
= 102900

2:

a: 27(x-45)=0

=>x-45=0

=>x=45

b: (x-47)-115=0

=>x-47=115

=>x=162

d: x-105:21=15

=>x-5=15

=>x=20

1:

a: =35*(34+86)+65*(75+45)

=120*35+120*65

=120*100=12000

b: \(=39\left(53+47\right)-21\left(53+47\right)\)

=18*100=1800