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\(43\left(53-81\right)+53\left(81-43\right)\)

\(=43.53-81+53.81-43\)

\(=81\left(53-43\right)\)

\(=81.10\)

\(=810\)

\(43\left(53-81\right)+53\left(81-43\right)\)

\(=43.53-43.81+53.81-53.43\)

\(=\left(43.53-53.43\right)+81\left(-43+53\right)\)

\(=0+81.10\)

\(=810\)

\(43\left(53-81\right)+53\left(81-43\right)\)

\(=43.53-81+53.81-43\)

\(=81\left(53-43\right)\)

\(=81.10\)

\(=810\)

a,=75-5*15-5*40+60

=75-75-60+60

=0+0

=0

b,=35-7*5-7*18

=35-35-126

=0-126

=-126

c,(cau c hinh nhu sai de)

d,=43*53-43*81+53*81-53*43-31

=(43*53-53*43)+81*(-43+53)-31

=0+81*10-31

=810-31

=779

  43.(53-81) + 53.(81-43)

= 43.(-38) + 53.38

= -43.38 + 53.38

= 38.(-43 + 53)

= 38.10

= 380

43.(53-81) +53.(81-43)

= 43.(-28)+53.38

= -1204+2014

= 810

tính thường hay tính nhanh vậy bạn?

Nguyễn Hoàng Thiên Di

tính thường cx đc mà tính nhanh càng tốt nha

đợi mik xíu vì giải hơi dài ạ

a, 53.(-15)+(-15).47

=(-15)(53+47)

=(-15).100

=-1500

b, 43.(53-81)+53.(81-43)

=43.(-28)+53.38

=810

c,(-5).8+53.(81-43)

=-45+53.38

=1969

d, ban tu giai nốt

a,-15 . (53+47)

 = -15 . 100

=-1500

b,43.53-43.81+53.81-43.53

=(43.53-43.53)+81.(-43+53)

= 0 + 81.10

=0+810

=810

c,-40+-8

=-48

d,3.16+(-10)-20

=48+(-10)-20

=38-20

=18

a) 53 . (-15) + (-15) . 47

= (53 + 47) . (-15)

= 100 . (-15) 

= -1500

b) 43 . (53 - 81) + 53 . (81 - 43)

= 43 . (-28) + 53 . 38

= -1204 + 2014

= 810

c) (-5) . 8 + (-2) . 3

= (-5) . (-2) . (-4) + (-2) . 3

= 20 . (-2) + (-2) . 3

= (20 + 3) . (-2)

= -46

d) 3 . (-4)² + 2 . (-5) - 20

=  3.16 + (-10) - 20

= 18

k cho tớ nha bn

1) (-25).8.(-4).(-125)

= [(-25).4].[(-125).8]

=(-100).(-1000)

=100000

2)30.(5-10)

=30.5-30.10

=30.5-300

=150-300

=(-150)

3) 43.(53-81)+53.(81-43)

=43.53-43.81+53.81-53.43

=(43.53-53.43)+(43.81-53.81)

=0+81.(43-53)

=(-810)

4) Mk chưa biết làm nha

1) (-25).8.(-4).(-125)

= [ (-25) . (-4) ] . [ 8 . (-125) ]

= 100 . (-1000)

= -100 000

2) 30.(-5-10)

= 30 . (-15)

= -450

3) 43.(53-81)+53.(81-43)

= 43 . 53 - 43 . 81 + 53 . 81 - 53.43

= -43 . 81 + 53 . 81

= 81 . ( -43 + 53)

= 81 . 10

= 810

4) (-6)².(-17)+23.(-36)-72.30

= 36 . (-17) + 23 . (-36) - 72. 30

= (-36) . 17 + 23 . (-36) - 72 . 30

= (-36) . ( 17 + 23 ) - 72 . 30

= (-36) . 40 - 72.30

=  (-1440 )- 2160

= -3600

# HOK TỐT #

1) (-25).8.(-4).(-125)

=[-25.(-4)].[8.(-125)]

=100.(-1000)

=-100000

2) 30.(-5-10)

=30.(-15)

=-450

3) 43.(53-81)+53.(81-43)

=43.(-28)+53.38

=-1176+2014

=838

4) (-6)².(-17)+23.(-36)-72.30

=36.(-17)+23.(-36)-72.30

=36.(-17)+(-23).36-72.30

=36.[-17+(-23)]-72.30

=36.(-40)-72.30

=-1440-2160

=-3600

\(\text{a) 43 (53 - 81) + 53 (81 - 43) }\)

\(=43.53-43.81+53.81-53.43\)

\(=53.\left(43-43\right)+81.\left(-43+53\right)\)

\(=53.0+81.10\)

\(=810\)

\(\text{ b) 4. (-5)2 + 2.(-5) - 20}\)

\(=\left(-20\right).2+2.\left(-5\right)-20\)

\(=2.\left[\left(-20\right)+\left(-5\right)\right]-20\)

\(=2.\left(-25\right)-20\)

\(=-50-20\)

\(=-70\)

\(\text{c) 27. (15 - 12) - 15. (27 - 12) }\)

\(=27.15-27.12-15.27+15.12\)

\(=15.\left(27-27\right)+12.\left(-17+15\right)\)

\(=15.0+12.\left(-2\right)\)

\(=-24\)

\(\text{ d) 53 + (-51) + (-53) + 49}\)

\(=53-51-53+49\)

\(=\left(53-53\right)+\left(-51+49\right)\)

\(=0+\left(-2\right)\)

\(=-2\)

chúc bạn học tốt

54.(53-81)+53.(81-54)

=(54-54)+(53-53).(21-81)

=0+0.0

=0

Tick mk du 100 nha.

\(54.\left(53-81\right)+53.\left(81-54\right)=53.54-54.81+53.81-53.54=53.81-54.81=81.\left(53-54=-81\right)\)

54.(53-81)+53.(81-54)

=54.53-54.81+53.81-53.54

=53.81-54.81

=-81

Tick mk vài cái lên 280 nha !!!