a)73+86+968+914+3032

= (86 + 914) +(968 + 3032) + 73

= 1000 + 4000 + 73

= 5073

b)341.67+341.16+659.83

=341 (67 + 16) + 659 * 83

= 341 * 83 + 659 * 83

= (341+ 659) * 83

= 1000 * 83

= 830000

c)252-84:21+7

= 252 - 2 +7

=257

d)4.8.25.125.27

= (8 * 125) (4* 25) * 27

= 1000 * 100 * 27

= 2700000

e)34+35+36+37-24-25-26-27

= (34-24) + (35-25) + (36-26) + (37-27)

= 10 + 10 + 10 + 10

= 40

g)1-2+3-4+...-98+99

= (1 + 99) + (-2-98) + .....+ (-48 - 52) + (49 + 51) - 50

= 100 - 50

= 50

h)1-4+7-10+...-100+103

Bài 2:Tìm số nguyên x,biết:

l)3636:(12.x-91)=36

3636 : (12x - 91) = 36

12x - 91 = 101 

12x = 192

x= 16 

m)(x:23+45).67=8911

x: 23 + 45 = 133

x : 23 = 88

x= 88/23

n)[(6.x-39):7].4=12

6x - 39 = 3

6x = 42

x=7

p)128-3(x+4)=23

3(x+4) = 105

x+4= 35

x= 31

q)[(4.x+28).3+55]:5=35

(4x + 28)*3 +55 = 175

(4x + 28) * 3 = 120

4x + 28 = 40

4x = 12

x=3

r)123-5.(x+4)=38

5(x+4) = 85

x+4 = 17 

x= 13 

t)11-(53+x)=97

53 + x = -86

x= -139

i)23.75+25.23+180

= 23(75+25) + 180

= 2300 + 180 

= 2480 

https://friend20.com/vn/d20/quiz/69707687

  341.67+341.16+659.83

=341.(67+16) +659.83

= 341 . 83 + 659 .83

= 83 .( 341+659)

= 83. 1000

= 83 000

341.67 + 341 .16 + 659 . 83

=22847+5456 +54697

=575300

=341(67+16)+659.83

=341.83+659.83
=83(341+659)

=83.1000

=83000

Đáp án cần chọn là: A

Ta có: 341.67+341.16+659.83=341.(67+16)+659.83=341.83+659.83=

=83.(341+659) =83.1000=83000.

= 341 . ( 67 + 16 + 83 )

= 341 . 166

= 56606

=341.(67+16)+659.83

=341.83+659.83

=83.(341+659)

=83.1000

=83000

341.67+341.16+659.83

=341.(67+16)+659.83

=341.83+659.83

=83.(341+659)

=83.1000

=83000

=341(67+16)+659.83=341.83+659.83=(341+659)83=1000.83=83000

a: \(=341\cdot\left(67+16\right)+659\cdot83\)

\(=83\left(341+659\right)\)

\(=83\cdot1000=83000\)

b: \(=\dfrac{21}{31}+\dfrac{10}{31}+\dfrac{-16}{7}+\dfrac{44}{53}+\dfrac{9}{35}\)

\(=1-\dfrac{16}{7}+\dfrac{44}{53}+\dfrac{9}{35}\)

\(=\dfrac{-9}{7}+\dfrac{9}{35}+\dfrac{44}{53}=\dfrac{-368}{1855}\)

341.67+341.16+659.83=341.(67+16)+659.83

                                 =341.83+659.83

                                 =83.(341+659)

                                 =83.1000

                                 =83000

42.53+47.156-47.114=42.53+47.(156-114)

                              =42.53+47.42

                              =42.(53+47)

                              =42.100

                              =4200

341.67 + 341.16 + 659.83 = 83000

42.53 + 47.156 - 47.114 = 4200

mk là người đầu tiên

1342.66

42.572

mk nhanh nhất tk nhá!

\(341.67+341.16+659.83\)

\(=341.\left(67+16\right)+659.83\)

\(=341.83+659.83\)

\(=83.\left(341+659\right)\)

\(=83.1000\)

\(=83000\)

\(341.67+341.16+659.83=341.\left(67+16\right)+659.83=341.83+659.83=83.\left(341+659\right)=83.1000=83000\)

341.67+341.16+659.83

= 341.(67+16)+659.83

= 341.83+659.83

= 83.(341+659)

= 83.1000

= 83000