Question

Tinh bang cach thuan tien nhat :

a) 27,42 + 51,24 + 22,58 - 28,76

b)28,67 x 99 + 28,67

Answer 1

a) 27,42 + 51,24 + 22,58 - 28,76

= 51,24 + 28,76 - 27,42 + 22,58

= 80 - 50 

= 30

b) 28,67 x 99 + 28,67

= 28,67 x 99 + 28,67 x 1 

= 28,67 x ( 99 + 1 )

= 28,67 x 100

= 2867

^ - ^

Answer 2

a,27,42+51,24+22,58-48,76

=(27,42+22,58)+(51,24-48,76)

=50+2,48

=52,48

b,28,67x99+28,67

=28,67x99+28,67x1

=28,67x(99+1)

=28,67x100

=2867

P/s : học vui^^ 

Answer 3

a) 27,42+51,24+22,58-28,76

=27,42+22,58-51,24+28,76

=50+80=130

b) 28,67x99+28,67

=28,67x99+28,67x1

=28,67x(99+1)

=28,67x100=2867

Answer 4

a, 27,42 + 51,24 + 22,58 - 28,76 

= ( 51,24 + 28,76 ) - ( 27,42 + 22,58 )

= 70 - 50

= 20

b, 28,67 x 99 + 28,67

= 28,67 x 99 + 28,67 x 1

= 28,67 x ( 99 + 1 )

= 28,67 x 100

= 2867

Answer 5

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