Question

tính nhanh

20 x 10 + 70 x 10 + 10

Answer 1

20 x 10 + 70 x 10 + 10

= (20 + 70) x 10 + 10

=  90 x 10 + 10

=    900 + 10

=        910

Answer 2

20 x 10 + 70 x 10 + 10

= 20 x 10 + 70 x 10 + 10 x 1

= 10 x ( 20 + 70 + 1 )

= 10 x 91

= 910

Answer 3

ket qua bang

910

nha ban tk minh nha

thanks