b, [ 5( x^3 - y^3 )^4 + ( x - y )^3 ]:( x^2 - 2xy + y^2 )
Giải thích
b) Ta có [ 5( x3 - y3 )4 + ( x - y )3 ]:( x2 - 2xy + y2 )
= [ 5( x - y )4( x2 + xy + y2 )4 + ( x - y )3 ]:( x - y )2
= 5( x - y )2( x2 + xy + y2 )4 + ( x - y )
b) Ta có [ 5( x3 - y3 )4 + ( x - y )3 ]:( x2 - 2xy + y2 )
= [ 5( x - y )4( x2 + xy + y2 )4 + ( x - y )3 ]:( x - y )2
= 5( x - y )2( x2 + xy + y2 )4 + ( x - y )