dễ mà cậu ấn máy tính casio là ra kết quả k cho mình nhé

c) C=(-4).2.(-25).(-3).8.5.125

C= 

d) D=(125-25).(-37)+63.(-28-72)

=100.

C=-8*75*40*125

C=-600*5000

C=-3000000

D=100*(-37)+63*(-100)

D=-3700-6300

D=-10000

a) \(\left[\left(25-2^2.3\right)+\left(3^2.4+16\right)\right]:5\)

\(=\left[\left(25-4.3\right)\right]+\left(9.4+16\right):5\)

\(=\left[\left(25-12\right)+\left(36+16\right)\right]:5\)

\(=\left[13+52\right]:5\)

\(=65:5\)

\(=13\)

b)\(125\left(28+72\right)-25\left(3^2.4+64\right)\)

\(=125.100-25\left(9.4+64\right)\)

\(=12500-25.\left(36+64\right)\)

\(=12500-25.100\)

\(=12500-2500\)

\(=10000\)

2/25=.2../25                                                                                                               .27../36=3/4                                         

3/.12..=9/36

15/27=5/..9.. 

..20..28=5/7

36/72=..1../2

\(\dfrac{2}{25}=\dfrac{2}{25}\)
\(\dfrac{27}{36}=\dfrac{3}{4}\)
\(\dfrac{3}{12}=\dfrac{9}{36}\)
\(\dfrac{15}{27}=\dfrac{5}{9}\)
\(\dfrac{20}{28}=\dfrac{5}{7}\)
\(\dfrac{36}{72}=\dfrac{1}{2}\)

TK
2/25=.2../25
27../36=3/4                                        
3/.12..=9/36

15/27=5/..9.. 

..20..28=5/7

36/72=..1../2

a 86+14+357=100+357=457

b 72+128+69=200+69=269

c (25.4).(5.2).4.27

=100.10.4.27

=1000.4.27

=4000.27=64000

d 28. (64+36)=28.100=2800

nha

a) 86 + 357 + 14                                               b ) 72 + 69 +128

= ( 86 + 14 ) + 357                                              = ( 72 + 128 ) + 69

= 100 + 357                                                        = 200 + 69 = 269              

= 457

c) 25 . 5 . 4 . 27 .2

= ( 25.4).(5.2).27

= 100 x 10 x 27

= 1000 x 27

= 27 000

d) 28.64+28.36

= 28 . ( 64 + 36 )

= 28.100

= 2800

a) 86 + 357 + 14

= ( 86 + 14 )+ 357

= 100 + 357 

= 457

b) 72 + 69 + 128

= ( 72 + 128 ) + 69

= 200 + 69

= 269

c) 25 . 5 . 4 . 27 . 2 

= ( 25 . 4 ) . ( 5 . 2 ) . 27

= 100 . 10 . 27

= 1000 . 27

= 27000

a)=9*3-26

   =27-26

   =1

b)=125*100-25*100

   =12500-2500

   =10000

1) 2155-(174+2155)+(-68+174-7)-1911-(1234-1911)

=2155-174-2155+(-68)+174-7-1911-1234+1911

=(2155-2155)+(174-174)+(1911-1911)-(68+7+1234)

= 0 + 0 + 0 - 1309

= -1309

1

a) \(\frac{14}{7}+\frac{5}{9}+\frac{4}{9}-2\)

\(=2\frac{5}{9}+\frac{4}{9}-2\)

\(=3-2=1\)

b) \(\frac{31}{25}+\left(\frac{15}{16}-\frac{6}{15}\right)+\frac{1}{16}\)

\(=\frac{31}{25}+\frac{43}{80}+\frac{1}{16}\)

\(=1\frac{311}{400}+\frac{1}{16}\)

\(=1\frac{21}{25}\)

1: Ta có: \(2155-\left(174+2155\right)+\left(-68+174\right)\)

\(=2155-174-2155-68+174\)

=-68

2) Ta có: \(-25\cdot72+25\cdot21-49\cdot25\)

\(=-25\cdot\left(72-21+49\right)\)

\(=-25\cdot100=-2500\)