Thực hiện phép tính (2x^2 + y^2/2)(x/3 + y/2)(1 - xy/3)
Giải thích
Ta có: 2x2+y22x3+y21−xy3
=2x22+y22x3+y213−xy3
=2x22x3+y2+y22x3+y213−xy3
=x3.2x22+y2.2x22+x3.y22+y2.y2213−xy3
=2x36+x2y2+xy26+y3413−xy3
=x3313−xy3+x2y213−xy3+xy2613−xy3+y3413−xy3
=13x33−xy3x33+13x2y2−xy3x2y2+13xy26−xy3xy26+13y34−xy3y34
=x39−2x4y9+x2y6−x3y36+xy218−x2y318+y312−xy412
=x3−2x4y9+x2y−x3y36+xy2−x2y318+y3−xy412