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
3(xy-2z)+(-xy+3z)等于多少?
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