a, 46*42+46*5+23*2*10+46*42+46=46*(42+5+10+42+1)=46*100=4600

b,5/3*1/9+5/3*5/9+5/3*7/9-5/3*4/9=5/3*(1/9+5/9+7/9-4/9)=5/3*1=5/3

a) 46 x 42 + 46 x 5 + 23 x 2 x 10 + 46 x 42 + 46

= 46 x 42 + 46 x 5 + 46 x 10 + 46 x 42 + 46

= 46 x (42 + 5 + 10 + 42 + 1)

= 46 x 100

= 4600

b) \(\frac{5}{3}\times\frac{1}{9}+\frac{5}{3}\times\frac{5}{9}+\frac{5}{3}\times\frac{7}{9}-\frac{5}{3}\times\frac{4}{9}\)

\(=\frac{5}{3}\times\left(\frac{1}{9}+\frac{5}{9}+\frac{7}{9}-\frac{4}{9}\right)\)

\(=\frac{5}{3}\times1\)

\(=\frac{5}{3}\)

\(a;46\times42+46\times5+23\times2\times10+46\times42+46\)

\(=46\times\left(42+5+10+42+1\right)\)

\(=46\times100=4600\)

cái dell gì zợ????????????

`1/2 -1/3= 3/6 -2/6=1/6`

`1/5 -1/7= 7/35 - 5/35=2/35`

`7/9 -2/5= 35/45 - 18/45=17/45`

`1/2 + 1/3 = 3/6 + 2/6= 5/6`

`2/5 + 1/4 + 1/3 = 24/60 + 15/60 + 20/30=59/30`

`17/42 + 3/7= 17/42 + 18/42=35/42=5/6`

`16/17 - 12/13=4/221`

`a)1/2-1/3`

`=3/6-2/6`

`=1/6`

__

`b)1/5-1/7`

`=7/35-5/35`

`=2/35`

__

`c)7/9-2/5`

`=35/45-18/45`

`=17/45`

__

`d)1/2+1/3`

`=3/6+2/6`

`=5/6`

__

`e)2/5+1/4+1/3`

`=24/60+15/60+20/60`

`=59/60`

__

`g)17/42+3/7`

`=17/42+18/42`

`=35/42`

__

`h|)16/17-12/13`

`=208/221-204/221`

`=4/221`

`a, 1/2 - 1/3  = 3/6 - 2/6 = 1/6 `           

`b, 1/5 - 1/7 = 7/35 - 5/35 = 2/35 `       

`c, 7/9 - 2/5 = 35/45 - 18/45 = 17/45`

`d, 1/2 + 1/3= 3/6 + 2/6 = 5/6 `           

` e, 2/5 + 1/4 + 1/3 = (24+15+20)/60 = 59/60`   

`g,17/42 + 3/7 = 17/42 + 18/42 = 35/42`

`h, 16/17 - 12/13= 208/221 - 204/221 = 4/221`

bài 1

A)37/60

B)13/45

C)1/4

bài 2

a)42/25:y/5=5/6

y=10,08

b)27/y:9/4=3/7

y=28

\(\text{1)}4.2^3-36:9\Rightarrow\text{4*2^3-36/9}\)

\(\text{2)}52.63+52.18-19.52\Rightarrow\text{52*63+52*18-19*52}\)

\(\text{3)}5^3.5^2.\left[42-\left(15-5\right)^2\right]\Rightarrow\text{5^3*5^2*(42-(15-5)^2}\left(\text{do trong excel không dùng dấu [ ]}\right)\)

\(\text{4)}\frac{1}{2}.\frac{1}{3}+\frac{1}{4}:\frac{1}{5}+\left(\frac{1}{2}\right)^3\Rightarrow\text{1/2*1/3+(1/4)/(1/5)+(1/2)^3}\)

11

9/10

11

9/10

 Cái sau là 9/10

a.-1,75-(-\(\dfrac{1}{9}\)-2\(\dfrac{1}{8}\))
-1,75-\(\dfrac{1}{9}+\dfrac{17}{8}\)
\(-\dfrac{7}{4}-\dfrac{1}{9}+\dfrac{17}{8}\)
\(\dfrac{-126}{72}-\dfrac{8}{72}+\dfrac{153}{72}\)
=\(\dfrac{19}{72}\)

b.\(\dfrac{-1}{12}-\left(2\dfrac{5}{8}-\dfrac{1}{3}\right)\)
\(\dfrac{-1}{12}-\left(\dfrac{21}{8}-\dfrac{1}{3}\right)\)
\(\dfrac{-1}{12}-\dfrac{21}{8}+\dfrac{1}{3}\)
\(\dfrac{-2}{24}-\dfrac{63}{24}+\dfrac{64}{24}\)
=\(\dfrac{-1}{24}\)

\(\dfrac{-5}{6}-\left(\dfrac{-3}{8}+\dfrac{1}{10}\right)\)
\(\dfrac{-5}{6}-\dfrac{-3}{8}-\dfrac{1}{10}\)
 

s: \(=125\cdot100-25\cdot192\)

\(=12500-4800\)

=7700