Question

Tính

a) -35.(47+177)+45.(35+177)

Answer 1

-35(47+177)+45(35+177)=-35.224+45.212=-7840+9540=1700

Answer 2

= -35 . 47 + ( -35) . 177 + 45 . 35 + 45 . 177

= -35 . 47 + 45 . 35 + 45 . 177 + ( -35) . 177

= 35 . ( -47) + 45 . 35 + 45 . 177 + ( -35) . 177

= 35. [( -47) + 45 ] + 177. [ 45 +( -35) ]

= 35 .( -2) + 177 .10

= - 70 + 1770 = 1700