问题
解答题
先去括号,在合并同类项:3(2x2-y2)-2(3y2-2x2)
答案
3(2x2-y2)-2(3y2-2x2)
=6x2-3y2-6y2+4x2
=(6x2+4x2)+(-3y2-6y2)
=10x2-9y2.
先去括号,在合并同类项:3(2x2-y2)-2(3y2-2x2)
3(2x2-y2)-2(3y2-2x2)
=6x2-3y2-6y2+4x2
=(6x2+4x2)+(-3y2-6y2)
=10x2-9y2.