*Lưu ý: "." là dấu nhân nha!

  27.36+15.72-36.47

=27.36+15.2.36-36.47

=27.36+30.36-36.47

=36.(27+30-47)

=36.10

=360

Chúc em học tốt!

#Dũng#

a) 13x(-27)+(-73)x13                       b) 42x35-135x42                         

   = 13x[(-27)+(-73)]                            = 42x(35-135)

    = 13x(-100)                                       = 42x(-100)

     = -1300                                             =-4200

c)136x(-47)+36x47                   d)-48x72+36x(-304)

    =-136x47+36x47                     =-48x2x36+36x(-304)

    =47x(-136+36)                         =-96x36+36x(-304)

     =47x(-100)                              =36x[(-96)+(-304)]

      =-4700                                   =36x(-400)

                                                     ==14400

9 x 4 x 198 - x 6 x 18 x 17 - 36 x 47 = 

a)=-136.47+36.47

=47(-136+36)

=47.(-100)

=-4700

b)=127-18.9

=127-162

=-35

136.(-47)+36.47

=100.(-47)+36.(-47)+36.47

=-4700+36.[(-47)+47]

=-4700+36.0

=-4700+0

=-4700

=36x198-2x3x18x17-36x47=

=36x198-3x36x17-36x47=

=36x(198-3x17-47)=36x[198-(51+47)]=36x(198-98)=36x100=3600

a),27x36+27x4+54x30

= 27x36+27x4+27x60

= 27x(36+4+60)

= 27x100 = 2700

b)125x25x5x8x2x4

= 125x8x25x4x2x5

=1000x100x10

= 1000000

c)125x37x32:4

= 125x8x37x4:4

= 1000x37

= 37000

\(a,27\cdot36+27\cdot4+54\cdot30=27\cdot36+27\cdot4+27\cdot60\)

\(=27\cdot\left(36+4+60\right)=27\cdot100=2700\)

\(b,125\cdot25\cdot5\cdot8\cdot2\cdot4=25\cdot4\cdot25\cdot5\cdot2\cdot4\cdot2\cdot4\)

\(=25\cdot25\cdot25\cdot4\cdot4\cdot4=100\cdot100\cdot100=1000000\)

\(c,125\cdot37\cdot32:4=125\cdot37\cdot8\)

\(=1000\cdot37=37000\)

. là nhân nha

a) 27 × 36 + 27 × 4 + 54 × 30

= 27 × 36 + 27 × 4 + 27 × 2 × 30

= 27 × 36 + 27 × 4 + 27 × 60

= 27 × ( 36 + 4 + 60 )

= 27 × 100 = 2700

b) 125 × 25 × 5 × 8 × 2 × 4

= ( 125 × 8 ) × ( 25 × 4 ) × ( 5 × 2 )

= 1000 × 100 × 10

= 1000000

c) 125 × 37 × 32 ÷ 4

= 4625 × 32 ÷ 4

= 148 000 ÷ 4

= 37 000

Cbht

36.47-18.94=18.2.47-18.94=18.94-18.94=0

=>2013.2014(36.47-18.94)=0

=201320141753 nhé

\(\frac{5}{12.17}+\frac{3}{34.10}+\frac{7}{60.9}+\frac{9}{27.36}\)

\(=\frac{5}{204}+\frac{3}{340}+\frac{7}{540}+\frac{9}{972}\)

\(=tự.tính.típ.nhé\)