问题
填空题
合并同类项:x2y-xy2+3x2y-xy2=______.
答案
x2y-xy2+3x2y-xy2,
=x2y+3x2y-xy2-xy2,
=(1+3)x2y-(1+1)xy2,
=4x2y-2xy2;
故答案为:4x2y-2xy2.
合并同类项:x2y-xy2+3x2y-xy2=______.
x2y-xy2+3x2y-xy2,
=x2y+3x2y-xy2-xy2,
=(1+3)x2y-(1+1)xy2,
=4x2y-2xy2;
故答案为:4x2y-2xy2.