粉色偶然_ly
幼苗
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AD:DB=8:7可得:
(AC+CD):DB=8:7
即:7(AC+CD)=8DB````````````````````````1
AC:CB=2:3 可得:
AC:(CD+DB)=2:3
即:2(CD+DB)=3AC`````````````````````````2
CD=6```````````````````````````````````````````3
联立1、2、3解得:
AC=18 、DB=21 、AB=45
1年前
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