题目内容
【题目】对于有理数a,b,定义a⊙b=3a+2b,则(x+y)⊙(x-y)化简后得_____________.
【答案】5x+y
【解析】∵a⊙b=3a+2b,
∴(x+y) ⊙(xy)=3(x+y)+2(xy)=3x+3y+2x2y=5x+y,
故答案为5x+y.
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题目内容
【题目】对于有理数a,b,定义a⊙b=3a+2b,则(x+y)⊙(x-y)化简后得_____________.
【答案】5x+y
【解析】∵a⊙b=3a+2b,
∴(x+y) ⊙(xy)=3(x+y)+2(xy)=3x+3y+2x2y=5x+y,
故答案为5x+y.