www.3112.net > iPhonE5s现在系统是10.3.2已经卡了,我想退回8.4.1...

iPhonE5s现在系统是10.3.2已经卡了,我想退回8.4.1...

…不是,好像不能降系统了

8.4×10.1-8.4×1.3 =8.4×(10.1-1.3) =8.4×8.8 =(8.6-0.2)(8.6+0.2) =8.6^2-0.2^2 =73.96-0.04 =73.92

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