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奥林匹克类数学题1.小玲家养了一群小兔,有白色的、灰色的,还有黑色的,3种颜色的小兔共有21只.白兔只数比灰兔的7倍多、比8倍少.小玲家养的3种颜色的小兔各有多少只?（列算式）2.在一道减法算式里,被减数、减数与差的和是840,其中减数是276,被减数是（ ）,差是（ ）.3.牧场的草可以供30头牛吃6个星期,那么这些草能供多少牛吃4个星期呢?（列算式）
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1.小玲家养了一群小兔,有白色的、灰色的,还有黑色的,3种颜色的小兔共有21只.白兔只数比灰兔的7倍多、比8倍少.小玲家养的3种颜色的小兔各有多少只?（列算式） 由已知可得,黑兔若为1只,则白兔不为整数,若黑兔为3只,则白兔超过总兔子数,所以这两种情况不存在.因此,黑兔应为2只,那么白兔将大于2*7小于2*8.即15只.然后用总数21-15-2=4.为灰兔的只数.综上,黑兔2只,白兔15只,灰兔4只.2.在一道减法算式里,被减数、减数与差的和是840,其中减数是276,被减数是（ ）,差是（ ）.被减数＝差＋减数被减数是840÷2＝420差是420－276＝1443.牧场的草可以供30头牛吃6个星期,那么这些草能供多少牛吃4个星期呢?牧场共有草30×6＝180能供多少牛吃4个星期180÷4＝45头
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其他类似问题
y=2 x=15 z=4420 14445
白：15 黑：4x=灰 y=白 z=黑x+y+z=21y=(7x+8x)/27.5x=yx+7.5x=21-z又因x=2的倍数x=2
y=15z=42、被减数是420
差是144因为被减数为x
差为yx+y=564
x-y=276得出：2x=840x=420 y=1443、30*6/4=45(头）
扫描下载二维码500 Servlet Exception
500 Servlet Exception
net.spy.memcached.OperationTimeoutException: Timeout waiting for value
at net.spy.memcached.MemcachedClient.get(MemcachedClient.java:924)
at cn.tianya.fw.plugin.cache.distributed.memcached.spy.FwSpyDirectMemcachedService$MemcachedDistributedGroup.get(FwSpyDirectMemcachedService.java:350)
at cn.tianya.fw.plugin.cache.distributed.memcached.spy.FwSpyDirectMemcachedService.get(FwSpyDirectMemcachedService.java:217)
at cn.tianya.wenda.util.WendaUtil.latestRewardNews(WendaUtil.java:1125)
at _jsp._error._500__jsp._jspService(error/../include/check.jsp:13)
at com.caucho.jsp.JavaPage.service(JavaPage.java:60)
at com.caucho.jsp.Page.pageservice(Page.java:570)
at com.caucho.server.dispatch.PageFilterChain.doFilter(PageFilterChain.java:179)
at com.caucho.server.webapp.DispatchFilterChain.doFilter(DispatchFilterChain.java:115)
at com.caucho.server.dispatch.ServletInvocation.service(ServletInvocation.java:229)
at com.caucho.server.webapp.RequestDispatcherImpl.forward(RequestDispatcherImpl.java:277)
at com.caucho.server.webapp.RequestDispatcherImpl.error(RequestDispatcherImpl.java:113)
at com.caucho.server.webapp.ErrorPageManager.sendServletError(ErrorPageManager.java:362)
at com.caucho.server.webapp.WebAppFilterChain.doFilter(WebAppFilterChain.java:175)
at com.caucho.server.dispatch.ServletInvocation.service(ServletInvocation.java:229)
at com.caucho.server.http.HttpRequest.handleRequest(HttpRequest.java:274)
at com.caucho.server.port.TcpConnection.run(TcpConnection.java:511)
at com.caucho.util.ThreadPool.runTasks(ThreadPool.java:520)
at com.caucho.util.ThreadPool.run(ThreadPool.java:442)
at java.lang.Thread.run(Thread.java:619)
Caused by: net.spy.memcached.internal.CheckedOperationTimeoutException:
Timed out waiting for operation - failing node: /19.2.192.16:11211
at net.spy.memcached.internal.OperationFuture.get(OperationFuture.java:65)
at net.spy.memcached.internal.GetFuture.get(GetFuture.java:37)
at net.spy.memcached.MemcachedClient.get(MemcachedClient.java:917)
at cn.tianya.fw.plugin.cache.distributed.memcached.spy.FwSpyDirectMemcachedService$MemcachedDistributedGroup.get(FwSpyDirectMemcachedService.java:350)
at cn.tianya.fw.plugin.cache.distributed.memcached.spy.FwSpyDirectMemcachedService.get(FwSpyDirectMemcachedService.java:217)
at cn.tianya.wenda.util.WendaUtil.latestRewardNews(WendaUtil.java:1125)
at _jsp._error._500__jsp._jspService(error/../include/check.jsp:13)
at com.caucho.jsp.JavaPage.service(JavaPage.java:60)
at com.caucho.jsp.Page.pageservice(Page.java:570)
at com.caucho.server.dispatch.PageFilterChain.doFilter(PageFilterChain.java:179)
at com.caucho.server.webapp.DispatchFilterChain.doFilter(DispatchFilterChain.java:115)
at com.caucho.server.dispatch.ServletInvocation.service(ServletInvocation.java:229)
at com.caucho.server.webapp.RequestDispatcherImpl.forward(RequestDispatcherImpl.java:277)
at com.caucho.server.webapp.RequestDispatcherImpl.error(RequestDispatcherImpl.java:113)
at com.caucho.server.webapp.ErrorPageManager.sendServletError(ErrorPageManager.java:362)
at com.caucho.server.webapp.WebAppFilterChain.doFilter(WebAppFilterChain.java:175)
at com.caucho.server.dispatch.ServletInvocation.service(ServletInvocation.java:229)
at com.caucho.server.http.HttpRequest.handleRequest(HttpRequest.java:274)
at com.caucho.server.port.TcpConnection.run(TcpConnection.java:511)
at com.caucho.util.ThreadPool.runTasks(ThreadPool.java:520)
at com.caucho.util.ThreadPool.run(ThreadPool.java:442)
at java.lang.Thread.run(Thread.java:619)
Resin-3.0.22 (built Mon, 13 Nov :38 PST)}