Question

[Đặng Phương Hạnh]

tinh nhanh

a, 326*728+327*272

b, 1235*6789*(630-315*2)

c, 2008*867+2009*133

d, (m:1-m*1):(m*2008+m+2008)

mn can gap lam nha 

cam on

Answer 1

[Vu Thi Nhuong]

a.326.728+327.272

=326.728+326.272+272

=326.(728+272) +272 

=326.1000 +272 

=326000+272 

=326272

B, 1235.6789.(630-315.2) 

=1235.6789.(630- 630)      

=1235.6789.0

=0        

C, 2008.867+2009.133 

=2008.867+2008.133 +133 

=2008.(867+133)+133 

=2008.1000 +133 

=2008000+133 

=2008133 

D, (m:1-m*1) : (m*2008+m+2008) 

= (m-m) : (m*2008+m+2008) 

= 0 : (m*2008+m+2008) 

=0