Question

tinh nhanh 

a) 16x4+16x5+16

b) 9x25+9x25+9x50

Answer 1

a)=16x4+16x5+16x1

   =16x(4+5+1)

   =16x10

   =160

b)=9x(25+25+50)

    =9x100

     =900

Answer 2

a) 16x4+16x5+16

= 16 x ( 4 + 5 ) + 16 

= 16 x 9 + 16

= 144 + 16

= 160

b) 9x25+9x25+9x50

= 9 x ( 25 + 25 + 50 )

= 9 x 100

= 900