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1、2015年初中升學(xué)考試調(diào)研測(cè)試(一)數(shù)學(xué)試卷參考答案及評(píng)分標(biāo)準(zhǔn)一、選擇題(每小題3分,共計(jì)30分)題號(hào)12345678910答案BADCBDCACA二、填空題(每小題3分,共計(jì)30分)題號(hào)11121314151617181920答案3a(m?n)21?x?306361或5332752x?2三、解答題(21—22題各7分,23—24各8分,25—27題各10分,共計(jì)60分)21.(本題滿分7分)mm?n?nmm?n1解:原式=????.....................................4分(m?n)(m?n)m
2、?n(m?n)(m?n)mm?n2333?m?2???2?,n?...............................................................................................2分2222112?原式=?..........................................................................................................1分33222??2222.(本題滿分7分
3、)(1)畫(huà)圖正確...............................................................................................................................................3分B1坐標(biāo)為(0,2).........................................................................................................
4、...........................1分(2)畫(huà)圖正確.................................................................................................................................................3分23.(本題滿分8分)(1)解:6?0.12?50(戶),m?50?0.24?12,n?50?0.32?16(戶)............................
5、.........3分(2)補(bǔ)圖正確..................................................................................................................................................2分(3)解:1500?(1?0.12?0.24?0.32?0.20)?180(戶)..............................................2分?估計(jì)該小區(qū)月平均用水量超過(guò)
6、20t的家庭大約有180戶...............................................................1分24.(本題滿分8分)(1)過(guò)點(diǎn)D作AB的垂線交AB的延長(zhǎng)線點(diǎn)H.在△BDH中∵DH與水平線平行∴∠BDH=30°.....................................................................1分3DHDH∴cos?BDH?cos30?????DH?33(米)..............................
7、................3分2BD6即廣告牌與鐵塔AB之間的水平距離為33米.1BHBH(2)由(1)可知sin?BDH?sin30?????BH?3(米)2BD6A45°過(guò)點(diǎn)C作AB的垂線,垂足為點(diǎn)K.在△ACK中∵CK與水平線平行∴∠ACK=45°...................................1分∴∠CAK=∠ACK=45°∴AK=CKCK在四邊形CDHK中?CD//HK??CKH??KHD??HDC?90?B∴四邊形CDHK為矩形∴KH=CD=4(米)CK=DH=33D30°H(米).....
8、........................................................................................................................2分(第