(-3xy+2xy)-(4xy+xy)
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(-3xy+2xy)-(4xy+xy)(-3xy+2xy)-(4xy+xy)(-3xy+2xy)-(4xy+xy)(-3xy+2xy)-(4xy+xy)=-xy-5xy=-6xy-6xy去括号后合并同
(-3xy+2xy)-(4xy+xy)
(-3xy+2xy)-(4xy+xy)
(-3xy+2xy)-(4xy+xy)
(-3xy+2xy)-(4xy+xy)
=-xy-5xy
=-6xy
-6xy
去括号后合并同类项
原式=-3xy+2xy-4xy-xy
=(-3+2-4-1)xy
=-6xy
先括号内化简，再去括号相减 (-3xy+2xy)-(4xy+xy)= - xy -5xy=-6xy
=(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
(-3xy+2xy)-(4xy+xy)
3xy-4xy-（-2xy）
3xy-4xy-（-2xy）
xy
3xy-3xy-xy+2yx
4xy+6xy-3xy=?
1.3xy -4xy-(2xy)
2xy.(-3xy)÷(xy)
2xy-xy-(-3xy)=
(-4xy^3)×（-xy）+（-3xy^2）^2
（-3xy^2)^2+(-4xy^3)*(-xy)=多少
(-4xy^3)*(-xy)+(-3xy^2)^2
(3xy^2)^2+(-xy^3)(4xy)
计算-xy-(4z-2xy)-(3xy-4z)
-xy(4z-2xy)-(3xy-4z) 化简
计算：3xy-4xy-（-2xy）要过程
（1）3xy-4xy-(-2xy)
3xy-4xy-(-2xy)的解法