有下列命题 ①G=是aGb成等比数列的充分非必要条件, ②若角αβ满足cosαcosβ=1则sin=0, ③若不等式x4x3<a的解集非空则必有a≥1, ④函数y=sinxsinx的值域是22. 其中正确命题的序号是 .(把你认为正确的命题的序号都填上)解由a G b 成等比 则a/G=G/b 即G^2=ab 即G=±√ab 即a G b 成等比可以推出G=正负根号ab 反之若G=正负根号ab 不妨设a=b=0,则G=0K wci v BU @ c‡ K Škj x †gvt R j wd Kv i A v jx R ‡q j côv b s 1 A a¨vq1 gvB‡µvK ‡›Uªvjvi gv B‡ µv K ‡ ›U vj v i GK ai ‡ bi c ÖMv ‡ gej Bw› U‡ M ‡U W m v wK ©U (IC ) 8wcb †_‡ K ï i æ K ‡i m v av ib Z 1 28 wc b chš Í n ‡q _v ‡K gv B‡µ v K‡›U v j vi‡ K wm ‡ ½j wP c K w ¤úD Uv i ejv †h ‡Z cv ‡ i
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