3(xy-2z)+(-xy+3z)等于多少?

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3(xy-2z)+(-xy+3z)等于多少?3(xy-2z)+(-xy+3z)等于多少?3(xy-2z)+(-xy+3z)等于多少?3(xy-2z)+(-xy+3z)=2xy-3z3(xy+2z)+(

3(xy-2z)+(-xy+3z)等于多少?
3(xy-2z)+(-xy+3z)等于多少?

3(xy-2z)+(-xy+3z)等于多少?
3(xy-2z)+(-xy+3z)
=2xy-3z

3(xy+2z)+(-xy+3z)
=3xy+6z-xy+3z
=2xy+9z

3(xy-2z)+(-xy+3z)=2xy-3z