(1374 x 57 + 687 x 86) : (26 x 13 + 74 x 14) =

(1374 x 57 + 1374 x 43) : (26 x 13 + 74 x 13 + 74)

(1374 x 100) : (13 x 100 + 74) =

137400 : 1374 = 100

tic mk nhé

(124*237+152): (870+235*122)

Ai Giải hộ mình với

mik thắc mắc tại sao 26 x 13 + 74 x 14  lại đc viết thành 26 x 13  + 74 x 13 + 74 vậy 

4 x 51 x 7 + 22 x 86 x 7 + 12 x 2 x 7

= 7 x ( 4 x 51 ) + ( 22 x 86 ) + ( 12 x 2 )

=7 x 204 + 1892 + 24

= 1428 + 1892 + 24

= 3320 + 24

= 3344

a) 86*(121-120+9)==86*10=860

b)136*(75+19+6)=136*100=13600

Mk giải r đó nha chắc chắn đúng

chao ban! Day la cau tra loi cua mh!

a,86*121-86*120+86*9

=86*(121-120+9)

=86*10

=860

b,136*75+136*19+136*6

=136*(75+19+6)

=136*100

=13600

Chuc ban hoc tot!!!

a)86 x (121-120+9)=860

b)136 x (75+19+6)=13600

Bài 2: Tính nhanh

a) 29 + 132 + 237 + 868 + 3

 = 29+(132+858)+(237+3)

=29+990+240

=1259

29+132+237+868+3

29+(132+868)+(237+3)

29+1000+240

29+(1000+240)

29+1240

1269

bài 2 :

a) 29 + 132 + 237 + 868 + 3

= 29 +(132 + 868)+(237 + 3)

= 29 + 1000 + 240

=1269

b) 35 . 34 + 35 . 86 + 65 . 75 + 65 . 5
= 35 .(34 + 86)+ 65 .(75 + 5)

= 35 . 120 + 65 . 80

= 4200 + 5200

= 9400

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

khum bít làm hehe

d) 12 . 53 + 53 . 172 - 53 . 84

= 53 . (12 + 172 - 84)

= 53 . 100

= 5300

Bài 3:

a) 4 . 52 - 18 : 32 hình như câu này sai đề

b) 32 . 22 - 32 . 19

= 32 . (22 - 19)

= 32 . 3

= 96

( 145 + 55) + ( 86 + 14)=
200             +100
300 nhé

145 + 86 + 14 + 55 

=(145+55)+(86+14)

=200+100

=300

145 + 86 + 14 + 55

= ( 145 + 55 ) + ( 86 + 14 )

= 200 + 100

= 300

HT

Câu 2:

a: x-158=32

=>x=158+32

=>x=190

b: \(x\cdot24=264\)

=>\(x=\dfrac{264}{24}\)

=>x=11

c: \(6x+9=3^7:3^4\)

=>\(6x+9=3^3\)

=>6x+9=27

=>6x=18

=>x=18/6=3

Câu 1:

a: \(86\cdot19+14\cdot19\)

\(=19\left(86+14\right)\)

\(=19\cdot100=1900\)

b: \(4\cdot\left(-5\right)^2-104\cdot\left(-5\right)^2\)

\(=4\cdot25-104\cdot25\)

\(=25\left(4-104\right)=-100\cdot25=-2500\)

c: \(7\cdot\left(-2\right)\cdot8\left(-5\right)\)

\(=7\cdot2\cdot8\cdot5\)

\(=56\cdot10=560\)

d: \(59-\left[59+\left(-76\right)\right]\)

\(=59-59+76\)

=76

( 1374 . 57 + 687 . 86 ) . ( 26 . 13 + 74 . 14 )

= ( 78318 + 59082 ) . ( 338 + 1036 )

= 137400 . 1374 = 188787600

( 124 . 237 +1 52 ) : ( 870 + 235 . 122 )

= ( 29388 + 152 ) :( 870 + 28670 )

= 29540 : 28540 = 1

a, ( 1374 . 57 + 687 . 86 ) : ( 26 . 13 + 74 . 14 )

= ( 1374 . 57 + 1374 . 43  ) :  26 . 13 + 74 . ( 13 + 1 ) 

= 1374 . ( 57 + 43 ) : ( 26 + 74 ) . 13 + 74

= ( 1374 . 100 ) : ( 100 . 13 + 74 )

= 137400 : ( 1300 + 74 )

= 137400 : 1374

= 100

b, ( 124 . 237 + 152 ) : ( 870 + 235 . 122 )

 = [ 124 . ( 235 + 2 ) + 152 ] : [ 870 + 235 . ( 124 - 2 ) ] 

= [ 124 . 235 + 124 . 2 + 152 ] : [ 870 + 235 . 124 - 235 . 2 ]

= [ 124 . 235 + 248 + 152 ] : [ 870 + 235 . 124 - 470 ] 

= [ 124 . 235 +  400 ] : [ 400 + 235 . 124 ]  = 1

a)

\(34.86+68.37\)

\(=34.2.43+68.37\)

\(=68\left(43+37\right)=68.70=4760\)

b)

\(47.25+137.49+47.75-37.49\)

\(=47\left(25+75\right)+49\left(137-37\right)\)

\(=47.100+49.100\)

\(=100\left(47+49\right)\)

\(=100.96\)

=9600

34 . 86 + 68 . 37

= 34 . 2 . 43 + 68 . 37

= 68 . 43 + 68 . 37

= 68 . (43 + 37)

= 68 . 100

= 6800

47 . 25 + 137 . 49 + 47 . 75 - 37 . 49

= 47 . (25 + 75) + 49 . (137 - 37)

= 47 . 100 + 49 . 100

= 4700 + 4900

= 9600

a)

\(34.86+68.37\)

\(=34.2.43+68.37\)

\(=68\left(43+37\right)\)

=68.80

=6880

b)

\(47.25+137.49+47.75-37.49\)

=47(25+75) +49(137 - 37 )

=47 . 100+ 49 .100

=100.(47+49)

=100.96

=9600