1, -55 . 78 + ( -13 ) . 78 - 78 . ( -65 )

   = 78 . ( -55 - 13 - 65 )

   = 78 . ( -133 )

   = -10374

Còn lại tự làm

\(1,-55.78+13\cdot\left(-78\right)-78.\left(-65\right)=78\left(-55-13-65\right)=78.\)

1.(−55).78+13.(−78)−78.(−65)=(−55).78+(−13).78−78.(−65)=78.(−55−13+65)=78.(−3)=−2342.−124+(−52).124.(−47)=(−1).124+124.2444=124.(2441−1)=124.2443=303056

Giải:

a)124+(-52).124 + (-124).(-47)

=124+(-52).124+124.47

=124+124.[(-52)+47]

=124+124.(-5)

=124.(-4)

=-496

b)(-2)³.(-6).(-5)³

=-8.(-6).(-125)

=-8.(-125).(-6)

=1000.(-6)

=-6000

Chúc bạn học tốt

7yuuugjhnbgmgfjtdh

dễ mà nhóm số tròn rồi tính như bình thường

a) 124+(-52).124+(-124).(-47)

=124+(-52).124+124.47

=124[1+(-52)+47]

=124.(-4)=-496.

b) -55.78+13.(-78)-78.(-65)

=(-55).78+(-13).78-78.(-65)

=78[(-55)+(-13)-(-65)]

=78.(-3)=-234.

Chúc bạn học tốt!

#Huyền#

\(124+\left(-52\right).124+\left(-124\right).\left(-47\right)\)

\(=124.1+\left(-52\right).124+124.47\)

\(=124.\left[1+\left(-52\right)+47\right]\)

\(=124.\left(-4\right)\)

\(=-496\)

\(-55.78+13.\left(-78\right)-78.\left(-65\right)\)

\(=-55.78+\left(-13\right).78-78.\left(-65\right)\)

\(=78.\left[\left(-55\right)+\left(-13\right)-\left(-65\right)\right]\)

\(=78.\left(-3\right)\)

\(=-234\)

Nhìn đáp án xấu quá à ~

khó quá đi!!

d) -55.78+13.(-78)-78.(-65)

=(-55).78+(-13).78-78.(-65)

=78[(-55)+(-13)-(-65)]

=78.(-3)=-234.

    Chúc bạn học tốt ~

áp dụng quy tắc đổi dấu

b) 35-19+2019-35-2019=-19+[(35-35)-(2019-2019)]

                                      =-19+0+=-19

a) \(124+\left(-56\right).124+\left(-124\right)\left(-47\right)=124.1-56.124+124.47\)

\(=124.\left(1-56+47\right)=124.\left(-8\right)=-992\)

b) \(35-19+2019-35+\left(-2019\right)=35-19+2019-35-2019\)

\(=\left(35-35\right)+\left(2019-2019\right)-19=0+0-19=0-19=-19\)

c) \(345-150\div\left[\left(3^3-24\right)^2-\left(-21\right)\right]+2020^0\)

\(=345-150\div\left[\left(27-24\right)^2+21\right]+1=345-150\div\left(3^2+21\right)+1\)

\(=345-150\div24+1=345-6,25+1=339,75\)

( − 124 ) + 54   .   124 + ( − 124 )   .   ( − 47 ) = ( − 124 )   .   1 + ( − 54 )   .   ( − 124 ) + ( − 124 )   .   ( − 47 ) = ( − 124 )   .   1 + ( − 54 ) + ( − 47 ) = ( − 124 )   .   ( − 100 ) = 12400.

\(-23-24-25+123+124+125\\ =\left(123-23\right)+\left(124-24\right)+\left(125-25\right)\\ =100+100+100\\ =300\)

=(-23+123)+(-24+124)+(-25+125)

=100+100+100

=300

=300