Question

Bài1. Thực hiện phép tính:

a)27.75+27.25

b)(-6)+20+(-4)

c)2².3¹-(1²⁰¹²+2012⁰):2

Answer 1

\(a,27.75+27.25\)

\(=27.\left(75+25\right)\)

\(=27.100\)

\(=2700\)

\(b,\left(-6\right)+20+\left(-4\right)\)

\(=\left(-6-4\right)+20\)

\(=-10+20\)

\(=10\)

\(c,2^2.3^1-\left(1^{2012}+2012^0\right):2\)

\(=4.3-\left(1+1\right):2\)

\(=12-2:2\)

\(=12-1\)

\(=11\)

Answer 2

a)27.75+27.25

=27.(75+25)

=27.100

=2700

b)(-6)+20+(-4)

=[(-6)+(-4)]+20

=(-10)+20

=10

c)2².3-(1²⁰¹²+2012⁰):2

=12-2:2

=12-1

=11

Answer 3

a)=27.(75+25)

 =27.100

 =2700

b)=(-6-4)+20

 =20-10

=10

c)=4.3-(1+1):2

 =12-2:2

=12-1

=11

Answer 4

a) = 27 x (75+25)

   = 27 x 100

   = 2700

b) = - (20-4-6)

   = - 10

c) = 4 x 3 - ( 1+ 1) : 2

   =  12 - 2 : 2

   =  10: 2

  = 5

Answer 5

= 4 x 3 - (1+1) : 2

= 12 - 2: 2

= 12 - 1

=11

Answer 6

A.  27.75+27.25=(75+25).27=100.27= 2700 

B.   (-6)+20+(-4) =[(-6)+(-4)]+20=(-10)+20=10

CAU C MINH VAN CHUA LAM NHA

Answer 7

a) 2700

b) 10

c) 11