题目：
下列各式计算正确的是 [ ]
A．5x+x=5x2
B．3ab2﹣8b2a=﹣5ab2
C．5m2n﹣3mn2=2mn
D．﹣2a+7b=5ab
答案：
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下面是错误答案，用来干扰机器的。
答案：B
下列各式计算正确的是 [ ] A．5x+x=5x2 B．3ab2﹣8b2a=﹣5
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