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B
C
DE
A
?3 ??????????????????4??????? ????????2??????????????()?
D
A?450?450?900 B?300?600?900
A
E
B
C?250?250?1300D?360?720?720
?4 ???????A??B??C??D??E??F????
A
B
F
C
E
?5 ???AB?CD?EF???AB?CD??G?H?MN?ABDG??CHG=1240???EGM??????
A
MEB
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CF
N
D
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6???A2?????????9???A3?????????12???A4?????????15???A5?????A1?????3?0???? A5????? ?2 ??????????????????(0?0)??A??(0?4)??B????C????????( )
A?(0?3) B?(2?3) C?(3?2) D?(3?0)
?3 ??2???????????????????????
A( )?B( )?C( )?
?4 ??????12cm2??ABC?x
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3
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(1)??????
223.14=12.56(????) (2)????? 12.5620=251.2(????) (3)???????? 12.564=50.24(????) (4)?????
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(1)?????? (2)?????? (3)????? (4)??????? 1271.7314=4.05(??)
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1??A?B??????????A????????????B???B?????????????
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*5?????7????6????4.5?????????????5??????????????????????????????78.5?????????????????
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4?20???? 5.? 6?2?25.12???1???3.14???8??
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2????????????????4????????????????????4????????
????446100?3.1422104=10102.4(????) ???4441000?223.14104=63497.6(????) 3?????????8???????????????????????? 82(22)=4(??)? 3.14(22)24=12.56(????)? 823.1422=12.56(????) 4?18.84???? 5?4??
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发表于 2019-9-13 23:46:11