解答

✨ 最佳解答 ✨

(P0S+mg)L = {P0S + (M + m)g}(L - l)

(P0S+mg)L = {P0S + (M + m)g}L - {P0S + (M + m)g}l

{P0S+(M + m)g}l = {P0S + (M + m)g}L - (P0S + mg)L

{P0S+(M + m)g}l = MgL

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