Trả lời

25.(187+1400)

=25.87+25.1400

=2175+35000

=37175.

25.(187+18+1382)

=25.(187+1400)

=25.187+1400

=25.1400+187

=35000+187

=35187

Đề có vẻ chưa đầy đủ em ạ 

bạn ơi mình thấy nó có vẻ hơi thiếu 

25.(187+18+1382)

= 25.(187+1400)

=25.1400+187

=3500 +187

= 35187

25 . ( 187 + 18 + 1328 )

=> 25 . 1533

= 3066

25x187+187x73+817x1+817x1

 = 187x(25+73+1+1)

= 187x100

=18700

25 × 187 + 187 × 73 + 817 + 817 

= 25 × 187 + 187 × 73 +187+187+1260

= 187 x ( 25+73+1+1) + 1260

= 187 x 100 + 1260

= 18700 + 1260

= 19960

chúc bn học tốt 

Sủa lại đề nhé

\(25\cdot187+187\cdot73+187+187\)

\(=187\cdot\left(25+73\right)+187+187\)

\(=187\cdot98+187+187\)

\(=187\cdot\left(98+1+1\right)\)

\(=187\cdot100\)

\(=18700\)

k fai tính nhanh thì dùng máy tính nah

1) 18+14+16+35+110+160+150+145+158+140+55+25

= (14+16)+(35+25)+(145+55)+(140+160)+(158+18)+(110+150)

= 30+ 60 +200+ 300+ 176+ 260

= 590+ 436= 1026.

2) 62+ 78 +48+ 96+85+ 91

= (62 +48)+ (96 +85 +91+ 78)

= 110 + 350= 460.

3) 107 +439 + 666 +673+ 358 + 187

= (107 + 673) + ( 439 + 666) + ( 358+ 187)

= 780 + (1105 + 545)

= 780+ 1650= 2430.

4) 187 + 62+ 78+48+ 96+ 85+ 91+107+ 439+ 666+ 673+ 358

= (187 + 673) + ( 62+ 78)+ (439+ 91)+ ( 85+ 358+ 107)+ (666+ 96+ 48) 

= (860+ 140)+ (530+ 550+ 810)

= 1000+ 1890= 2890.

ghê rồi

a. `306xx 18-306 xx 8=306 xx (18-8) =306 xx 10=3060`

b. `9 xx 9+25xx9 +33 xx18`

`=9 xx9 + 25 xx 9 + 33 xx 2 xx 9`

`=9x (9+25+33xx2)`

`=9 xx (9+25+66)`

`=9 xx 100`

`=900`

a) \(306\cdot18-306\cdot8=306\cdot10=3060\)

b) \(9\cdot9+25\cdot9\cdot33\cdot18=9\cdot9\cdot\left(1+25\cdot33\cdot2\right)=81\cdot1651=133731\)

a. 

b. 

a/ A= 119+(-213)+212+(-118)+2009

A= ! - 1 + 2009

A= 2009

b/ B=223+132+187-23-32-87

B = 200 + 100 + 100

B = 400

c/ C= -2012+(-596)+(-201)+496+301

C = -2012 - 100 + 100

C = -2012

 d/ D= -329+(15-101)-(25-440)

D = 0

hok tốt!!!

\(a,A=119+\left(-213\right)+212+\left(-118\right)+2009\)

\(A=\left(119+212+2009\right)+\left[\left(-213\right)+\left(-118\right)\right]\)

\(A=2340+\left(-331\right)\)

\(A=2009\)

\(b,B=223+132+187-23-32-87\)

\(B=\left(223+132+187\right)+\left(-23-32-87\right)\)

\(B=542-142\)

\(B=400\)

a, 32.(-64) - 64.68

   = -64( 32 + 68)

= -64 .100

= - 6400

b, -54.76 + 46.(-76)

= -76.(54 + 46)

= - 76. 100

= - 7600

c, 75.18 + 18.25

= 18.(75 + 25)

= 18 . 100

= 1800

d,  (-4).(3).(-125)(-25).(-8)

=   3.(-4. (-25).((-125).(-8)

= 3.100.1000

= 300000