a)5.(-8).2.(-3)

=[5.(-2)].[(-8).(-3)]

=-10.24

=-240

b)(45-135+72)-(45+72)

=45-135+72-45-72

=(45-45)+(72-72)-135

=0+0-135

=-135

c)3.(-5)².2+2.(-5)-20

=3.25.2+2(-5)-20

=75.2+(-10)-20

=150+(-30)

=120

d)86.(-46)+46.27-46.41

=86.(-1).46+46.27-46.41

=-86.46+46.27-46.41

=46(-86+27-41)

=46(-100)

-4600

e)34(15-10)-15(34-10)

=34.15-34.10-15.34+15.10

=(34.15-15.34)+(15.10-34.10)

=[34(15-15)]+[10(15-34)]

=34.0+10(-9)

=0+(-90)

=-90

=47-1=46

tui đoán bừa nek, 46

1/Ta co :

\(\dfrac{15}{7}.\left(\dfrac{1}{5}-\dfrac{46}{45}\right)+\dfrac{46}{45}.\left(\dfrac{15}{7}-\dfrac{45}{46}\right)\)

=\(\dfrac{15}{7}.\dfrac{1}{5}-\dfrac{15}{7}.\dfrac{46}{45}+\dfrac{46}{45}.\dfrac{15}{7}-\dfrac{46}{45}.\dfrac{45}{46}\)

=\(\dfrac{15}{7}.\left(\dfrac{1}{5}-\dfrac{46}{45}+\dfrac{46}{45}\right)-1\)

=\(\dfrac{15}{7}.\dfrac{1}{5}-1\)

=\(\dfrac{3}{7}-1=\dfrac{-4}{7}\)

2/Ta co

\(\dfrac{43}{47}.\left(\dfrac{18}{37}+\dfrac{47}{43}\right)-\dfrac{18}{3}.\left(\dfrac{43}{47}+\dfrac{37}{36}\right)\)

=\(\dfrac{43}{47}.\dfrac{18}{37}+\dfrac{43}{47}.\dfrac{47}{43}-\dfrac{18}{37}.\dfrac{43}{47}+\dfrac{18}{37}.\dfrac{37}{36}\)

=\(\dfrac{18}{37}.\left(\dfrac{43}{37}-\dfrac{43}{37}+\dfrac{37}{36}\right)+1\)

=\(\dfrac{18}{37}.\dfrac{37}{36}+1\)

=\(\dfrac{1}{2}+1=\dfrac{3}{2}\)

tick cho mk nha

t tick cho! ns nè,mai giải cho t vài bài vs...ko đùa!

a ) 48 - 73 + |15| - ( - 29 ) 

= -25 + 15 + 29 = 19

b) 134 + 46.( 39 - 78 ) - | 267 |

= 134 + 46.( -39 ) -  267 = -133 -1794 = -1927

c) 36 - 16.( -2 )² + ( - 53 )

= 36 - 16.4 - 53 = -17 - 64 = -81

d) ( 259 - 47 - 5 ) - ( 259 - 5 )

= 259 - 47 - 5 - 259 + 5  = - 5 + 5 + 259 - 259 = 0

e ) 325. 26 - 325 . 125 - 325 

= 325 (26 - 125 - 1) = 325. (-100) = -32500

Mọi người ơi giúp mình với

1-2+3-4+5-6+............+45-46+47-48+100

= (1-2)+(3-4)+(5-6)+............+(45-46)+(47-48)+100

=  (-1) + (-1) + (-1)+ ...............+(-1)+(-1) +100 ( có 24 cặp -1)

=(-1)x24+100

=( -24) +100

=76

Nhớ k cho mk nha! ^-^

45-58+(-45)+(+58)-3=45-58-45+58-3=(45-45)+(58-58)-3=-3

(-57)-(-12)+3-(-57)=-57+12+3+57=(-57+57)+12+3=15

-(-24)-(-30)+(-24)-30+8=24+30-24-30+8=(24-24)+(30-30)+8=8

-(-12)+(+19)-(+12)+8-19=12+19-12+8-19=(12-12)+(19-19)+8=8

47-(-53)+(-47)-(+53)=47+53-47-53=(47-47)+(53-53)=0

-(+28)+32-(-28)+(-34)=-28+32+28-34=(-28+28)-(34-32)=-2

15-(+72)+(-15)+(+72)=15-72-15+72=(15-15)+(72-72)=0

20-(+46)+(-25)-(-46)=20-46-25+46=(20-25)+(46-46)=-5

28-(-32)+(-28)-32+5=28+32-28-32+5=(28-28)+(32-32)+5=5

-75+(-49)+(+75)+49-12=-75-49+75+49-12=(-75+75)+(49-49)-12=-12

\(...=45-58-45+58-3=-3\)

\(...=-57+12+3+57=15\)

\(...=24+30-24-30+8=8\)

\(...=12+19-12+8-19=8\)

\(...=47+53-47-53=0\)

\(...=-28+32+28-34=-2\)

\(...=15-72-15+72=0\)

\(...=20-46-25+46=-5\)

\(=...28+32-28-32+5=5\)

\(...=-75-49+75+49-12=-12\)

\(\left[\left(46-32\right)^2-\left(54-42\right)^2\right]\times36-1872\)

\(=\left(14^2-12^2\right)\times36-1872\)

\(=\left(196-144\right)\times36-1872\)

\(=52\times36-1872\)

\(=1872-1872\)

\(=0\)