-6x(2/3x-2/5y)+12y(-3/8x+1/3y)=?
问题描述:
-6x(2/3x-2/5y)+12y(-3/8x+1/3y)=?
答
-6x(2/3x-2/5y)+12y(-3/8x+1/3y)
=-4x²+12/5xy-9/2xy+4y²
=4y²-2.1xy-4x²