【lianxiti】
1.shex⊕y=2x+3y,x⊙y=xy,qiex,yjunweizhengzhengshu,ruodangx⊙y=6shi,x⊕yqudezuixiaozhi,zexdengyu:
a.2 b.6 c.4 d.3
BG真人版2.mourenyaojiangyizhangbaiyuanrenminbizhibizhaoling,taxiwangsuohuanlingqian(renminbi)dezuidibizhiweishiyuan,gongyouhuanfazhongshushi( )zhong。
BG真人版a.4 b.6 c.8 d.9
3.
BG真人版10539,1054,105,11,1,( )
BG真人版a.-1 b.-9 c.1 d.0
4.
26,50,98,194,( )
a.388 b.386 c.390 d.384
5.mouguminchucirushi,diyitianshouxianyi8yuandejiagemairumougongsigupiao2qiangu,ranhouzaiqikuisun5%shiyoumairu1qiangu,shoupanshigaigongsigupiaojiagewei7.2yuan,diertiangaigongsigupiaokaipanzhangting(zhangfuwei10%),gaiguminsuijiyizhangtingjiamaichusuoyougaigongsidegupiao,ruguobukaolvyouguangupiaojiaoyideshuifei,gaiguminbenluncaozuodeyejiqingkuangshi( )。
a.yingli160yuan b.yingli400yuan
c.kuisun160yuan d.kuisun400yuan
【cankaodaan】
1.【答案】D。解析: x⊙y=xy=6,x⊕y=2x+3y≥2BG真人版2.【daan】c。jiexi: citikeyifenqingkuangtaolun。diyizhongqingkuang,hanyouyizhang50yuanshi,ze20yuankenengyou0,1,2zhang,gongyou3zhong;dierzhongqingkuang,buhanyou50yuan,ze20yuankenengyou0,1,2,3,4zhang,gongyou5zhong。yinci,gongyou5+3=8zhong,xuanc。
3.【daan】d。jiexi: qianyixiangchuyi10,bingsishewurudedaoxiayixiang。
4.【答案】B。解析:5.【daan】a。jiexi: mairudezonghuafeiwei8×2000+8×(1-5%)×1000=24000-400=23600yuan。maichudezongshouruwei7.2×(1+10%)×3000=23760yuan,zhuanle160yuan。
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