小刚每分钟跑am，用b分钟可跑完3000m，如果每分钟多跑10m，则可比以前提前一分钟跑完3000m。下列等式不正确的是[]A.（a+10）（b-1）=abB.（a-10）（b+1）=3000C.=a

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