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Li tried to evaluate an expression step by step. Find Li's mistake. What is the mistake he made. Is it A:step 1, B:step 2, C:step 3 or D: Li did not make a mistake ???

Li Tried To Evaluate An Expression Step By Step Find Lis Mistake What Is The Mistake He Made Is It Astep 1 Bstep 2 Cstep 3 Or D Li Did Not Make A Mistake class=
Li Tried To Evaluate An Expression Step By Step Find Lis Mistake What Is The Mistake He Made Is It Astep 1 Bstep 2 Cstep 3 Or D Li Did Not Make A Mistake class=