3(xy+2z)+(-xy+3z) 怎样做
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3(xy+2z)+(-xy+3z)怎样做3(xy+2z)+(-xy+3z)怎样做3(xy+2z)+(-xy+3z)怎样做3(xy+2z)+(-xy+3z)=3xy+6z-xy+3z=2xy+9z3(x
3(xy+2z)+(-xy+3z) 怎样做
3(xy+2z)+(-xy+3z) 怎样做
3(xy+2z)+(-xy+3z) 怎样做
3(xy+2z)+(-xy+3z)
=3xy+6z-xy+3z
=2xy+9z
3(xy+2z)+(-xy+3z)
=3xy+6z-xy+3z
=2xy+9z
谢谢 有什么不懂可以问我
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