安岳县华师大七年级下数学期末试卷

安岳县2014—2015学年度第二学期期末授课质量监测义务教育级数学试卷答案一、选择题（共10小题，每题3分）题号12345678910答案CABCCDBACB二、填空题（共6小题，每题3分）11.412．0和113．x(1+40%)×80%=24014.515.6816.13或9三、解答题（共9小题）解：（1）x=10···················································3分x1（2）y2·············································7分z3x4（1）原不等式变为····································4分x0所以原不等式组的解为0≤x＜4···································5分（2）图形略················································7分（1）解方程组得a5b3（2）若a=5为腰长，5+5＞3满足，此时三角形周长为：5×2+3=13··········6分若b=3为腰长，3+3＞5满足，此时三角形周长为：3×2+5=11··········8分x2x22kb320.解：（1）当3和5时，原方程组变为b···············2分yy2k5k2解得：·········································4分b12）由不等式3+2x＞m+3x得：x＜3-m····························5分又由题可知2＜3－m≤3········································7分0≤m1··················································8解：图略12342··································8解：1△ABC△DEBABDE7，BE＝BC4，··································2AE=AB-BE=7-4=3·········································42△ABC△DEB°°·································6A＝D＝35DBEC＝60DFA＝A+AEF＝A+D+DBE＝130°·······················8°°23.解：BECBEC=150EBC+ECB=30············1°°ABCA=50ABC+ACB=180°-50=130°················2∴ABE+ACE=130°30°=100°··································3∵BD、CDABEACE，Ａ2=1ABE，3=1ACE，22∴2+3=1(ABE+ACE)=1×100°=50°.522D∴DBC+DCB=(2+3)+(EBC+ECB)1E4=50°+30°=80°..723ＢＣ∴BDC=180°80°=100°..8724.解：1bc-2a0··············································2bc-80a=4·················································32b+c-8=0b=8-c···················································53a+b>c>b-a4+8-c>c>8-c-4··············································86>c>2················································925．解（1）xyxy65··········································26x3y285x30解之得···········································4分352）可设新同事中有a名男性，则新同事中女性为（3－a）名，由题可列方程为:0.9[30（1+6+a）+35(1+3+3