2021-2022学年宁夏石嘴山市名校毕业升学考试模拟卷数学卷含解析及点睛

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16•8CD••=~~~9CD2/.CD=1.ᙠRSBCDtBDZBC'CD?=1ᨵ,uᳮACFDs/iBCD,.CFCD•.=9BCBD.CF4.-.CF=^I,5/.AC=2C=1^.5ூ%v௃ὃwxᙊᕜzjᳮᚖjᳮ|}~zḄᑨjឋ)ᑗ'Ḅᑨjឋ)hijᳮDEBC=86⚪Ḅᐵ.22ஹ(1)ᡝ⌕ᜩ150ᐗ├ᑭ├jᓟ25ᐗᡈ35ᐗ(2)192ᐗ.ூ6᪆௃(1)pᑭᵨ2ᑭx├=ᑭefEVWDEᫀ(2)pᑭᵨ2ᑭx├=ᑭefEᦪᐵWᑭᵨᦪឋDEᫀ.ூY6௃(1)᪷M⚪(x-20)(-2x+l)=150,6xi=25,X2=35,ᡝ⌕ᜩ150ᐗ├ᑭ├jᓟ25ᐗᡈ35ᐗ(2)ᵫ⚪W=(x-20)(-2x+l)=-2(x-30)2+200,Va=-2,ᱥ'ᔣ¢£x<30¤y¥xḄᜧfᜧ§ᵫ¨<©J1Ḅ├Pª¨ᓟ28ᐗ...£x=28¤Wax=-2x(28-30)2+200=192(ᐗ).•••├jᓟ28ᐗ¤ᜩḄ├ᑭᨬᜧᨬᜧᑭ192ᐗ.ூ%v௃⚪®⌕ὃwx¯ᐗ?@ḄᵨG°ᦪḄᵨ±²ᵨᦪឋ6⚪ᐵ.

1723ஹ(1)=3(2)(-,0),(3,O'),(7,4)(1)-1Jூ᪆௃³⚪ᑖ᪆(1)ᵫᱥ'y=-x?+(m-1)x+mµy¶·¨(0,1)m=l..•.ᱥ'y=-X2+2X+1=-(x-1)2+2.ᑡ⊤-1X0121y01210(2)S-x2+2x+l=0,xi=-1,X2=l....ᱥ'µx¶Ḅ·%(-1,0),(1,0).Vy=-x2+2x+l=-(x-1)2+2ᱥ'⚔%ᙶ᪗(1,2).(1)ᵫn½¾£-IVxVl¤ᱥ'ᙠx¶s?.(2)ᵫn½¾£x>l¤yḄ¿¥x¿ḄᜧfÀὃ%ᦪḄÁᵨ24ஹ\6᪆

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