-6x(2/3x-2/5y)+12y(-3/8x+1/3y)=?

问题描述:

-6x(2/3x-2/5y)+12y(-3/8x+1/3y)=?

-6x(2/3x-2/5y)+12y(-3/8x+1/3y)
=-4x²+12/5xy-9/2xy+4y²
=4y²-2.1xy-4x²

=4y²-4x²-21xy/10

-6x(2/3x-2/5y)+12y(-3/8x+1/3y)
=-4x²+12/5xy-9/2xy+4y²
=4y²-2.1xy-4x²

4x²-4y²-33/5xy