EXCEL circular reference?

Users questions: For example A2B25 when A2 = 5B2 = 0 (self-0) +5 = 5 to A2 revised 100B2 = 5 (reference itself) +100 = 105 A2 again revised 1000B2 = 105 (reference to what their +1000 = 1105 Zuodao ? seek out expert teach!!! ! Urgent
Experts answer: in the "Tools" menu, click "Options", then click "re-calculation" tab. Select the "iterative calculation" checkbox. Maximum number of iterations 1 and then cell B2 enter = A2 + B2 on it.
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