(-3xy+2xy)-(4xy+xy)

分类: 作业答案 • 2023-01-23 14:55:42

问题描述：

(-3xy+2xy)-(4xy+xy)

答

去括号后合并同类项
原式=-3xy+2xy-4xy-xy
=(-3+2-4-1)xy
=-6xy

答

先括号内化简，再去括号相减 (-3xy+2xy)-(4xy+xy)= - xy -5xy=-6xy

答

=(1-2)+(3-4)+……+(2001-2002)
=(-1)+(-1)+……+(-1)
=(-1)×1001
=-10013a^2+a^2-[2a^2-2a]+[3a-a^2]
=3a^2+a^2-2a^2+2a+3a-a^2
=a^2+5a

答

-6xy

答

(-3xy+2xy)-(4xy+xy)
=-xy-5xy
=-6xy