Question

Tính:

a)237.(-26)+26.137

b)63.(-25)+25.(-23)

Answer 1

a) 237 . ( -26 ) + 26 . 137

=  ( - 237 ) . 26 + 26 . 137

= 26 . [ ( -237 ) + 137 ]

= 26 . ( -100 )

= -2600

b) 63 . ( -25 ) + 25 . ( -23 )

= ( -63 ) . 25 + 25 . ( -23 )

= 25 . [ ( -63 ) + ( -23 ) ]

= 25 . ( -86 )

= -2150

Answer 2

a)237.(-26)+26.137 =-237.26+26.137 =26(137-237) =26.(-100)=-2600 b)63.(-25)+25.(-23) =-63.25+25.(-23) =25(-63-23) =25.(-86)=-2150