深圳中考压轴题答:∵∠OAB=∠BAC,∠AOB=∠ABC=Rt∠ ,∴△ABO∽△ABC,∴ ,由此可求得:AC= 方法二:由题意知:tan∠OAB=(2)方法一:当B不与O重合时,延长CB交y轴于点D,过C作CH⊥x轴,交x轴于点H,则可证得AC=AD,BD=--4′ ∵AO⊥OB,AB⊥BD,∴△ABO∽△BDO,则OB2=AO×OD---6′,即 化简得:y= ,当O、B...
求高人告诉怎么学好英语答:造句, made a face or made faces 做鬼脸, be made in在…制造 , be made of由…制成, make tea沏茶, make friends with 与……交朋友, make up编出, made a mistake出差错, make sure确保,确信, make a noise吵闹 5)含take的短语有:take your time 不急;慢慢来, take, medicine 吃药;服药, ...