有理数的减法,有理数的加减混合运算和有理数的乘法一、填空题:1.12()的结果是_____________2.()()35的结果是___________3.计算|.|(.)8545___________4.直接写出结果(1)5916___________(2)3912()=___________(3)13123()()___________5.绝对值大于2且不大于5的所有整数的和为___________6.比-3小5的数是___________,比2325小的数的绝对值是___________,比a小-2的数是___________7.数轴上表示-5与3的两点的距离等于___________8.若||||abab312,,且、异号,则ab___________9.若abcac932,,,则b___________10.三个连续整数,中间一个数是a,则这三个数的和是___________11.计算412×[()]的结果是___________12.251254008.(.)().×××___________13.68685686812686817.().().()×××___________14.绝对值小于100的所有整数的积是___________15.已知||||()abcabc12302,则___________16.已知|||()|xxx2,则___________二、选择题:1.下列各式中计算结果等于3的是___________A.()()74B.|()()|74C.|()()|74D.||||742.一个数加上-2.4的和为-0.24,那么这个数是___________A.-2.16B.-2.64C.2.16D.2.643.()()()()1998的值是___________A.7B.-7C.25D.-254.若ab00,,则下列各式中正确的是___________A.ab0B.ab0C.ab0D.ab05.若mmm0,则||的值为___________A.正数B.负数C.0D.非正数6.下列各式中与abc的值不相等的是A.abc()B.abc()C.()()abcD.()()bac7.下列计算正确的是___________A.()()7642×B.()()3515×C.()200×D.7124712426××()8.已知||||xy32,,且xyxy·,则0的值等于___________用心爱心专心1A.5或-5B.1或-1C.5或-1D.-5或-19.如果6m是负数,则下列结论正确的是___________A.m0B.m0C.m0D.m010.在数轴上,点x表示到原点的距离小于3的那些点,那么||||xx33等于A.6B.-2xC.-6D.2x三、计算下列各题:1.(+8)-(-9)2.()()3143343.|()|||()()121491444.()()()()()30281814145.()()()()()1121142123341146.()()()3751347×××四、解答题:1.已知有理数x、y满足12120||||xyy,求372xy()的值。2.如果||||mnmn530,,且,求:()(||)mnmn的值。3.计算:1234567891011200120022003…用心爱心专心2参考答案一、填空题:1.32.23.134.(1)2(2)18(3)05.06.84152,,a7.88.4或-69.1410.3a11.-212.-10013.014.015.616.4二、选择题:1.D2.C3.C4.D5.B6.A7.C8.B9.A10.A三、计算题:1.172.73.74.-125.146.45四、解答题:1.由12120||||xyy可知:xyyyxxy0120121237231271220且则,则××()2.由||||mnmn535533,,则或-,或又由mn·0,则说明m、n同号则有mnmn5353,或,当mn53,时()(||)()||mnmn535310当mn53,时()(||)()||mnmn53536故原式=10或-6。3.原式()()()12345678200120022003…002004…()2004用心爱心专心3