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1、? 1?A?3x?2y=4z B?6xy+9=0 C?1 x+4y=6 D?4x=2 4y 2?A?228423119.23754624xyxyabxBCDxybcyxxy+=+=+= 3? 5a?11b=21 ?A? B? C? D? 4? y=1?x ? 3x+2y=5 ?A?3333.2422xxxxBCDyyyy= = = = 5?x?2?+?3y+2?2=0?A?1 B?2 C?3 D?3 26?43 235xyk xy=+=? x ? y ? !? k !“?7?#$?%“? 2 5?A?A?246246216246.22222222xyxyxyxyBCDyxxyyxyx+=+=+
2、=+=+=+=+? 9?BC? 2x+3y?4=0?DE x ?F?$GH y IJy=_(DE y ?F?$GH x IJx=_?10?K?1 2x+3y=2 ?L x=4 M?y=_(L y=?1 M?x=_?11? x3m?3?2yn?1=5 ? m=_?n=_?12?BC2, 3x y= =? x?ky=1 ?NO k=_?13?BC?x?1?+?2y+1?2=0? 2x?ky=4? k=_?14? x+y=5 ?PQ?_?15?R5 7x y= =I?21?BC?1 2x+3y=5?abcd?p?2?w?x?yz?x|?y?;&|23?25 28xy xy+=?YZ 2x?y=8YZ
3、 2x?y=8 ? x?y ?25 28xy xy+=?24? ?z?KQ? m?eT“ x ? 2x+9=2?m?2?x KQ? b?k?& m ?b?Vd ? x ? ? 1?D ?J?&?JE?&?C?()E?C? ? 1(*!$?Q$? 2?A ?J?&?JE?&?C?)&E?C? ?I 1(*&?Q$? 3?B ?J?M?&?&? 4?C ?JD?&F? 5?C ?JD? 6?B7?C ?Jhi?“?“? E?&?C?C?fi1 ?Q$?fl?A/Q_? 8?B ?9?4243 32xy10?4 3?1011?4 3?2 ?J 3m?3=1?n?1=1?m=4 3?n=2?12?1
4、?J2, 3x y= =F? x?ky=1 ?2?3k=1?k=?1?13?4 ?JBC x?1=0?2y+1=0?x=1?y=?1 2?11 2xy= F? 2x?ky=4 ?2+1 2k=4?k=1?14?J1234 4321xxxx yyyy= ?Jx+y=5?y=5?x?”x?y IPQ? ?x I“ 5 ?PQ?L x=1 M?y=4(L x=2 M?y=3( L x=3?y=2(L x=4 M?y=1?x+y=5 ?PQ?I1234 4321xxxx yyyy= 15?x+y=12 ?JR x ? y ?T?W 2x+y=17?2x?y=3 !? ?16?1 4 ?Jw23 16x
5、mxy yxny= =?V? 17?Jy=?3 M?3x+5y=?3?3x+5?3?=?3?x=4? ? 3x+5y= ? 3 S 3x?2ax=a+2 ? U?3?3?2a4=a+2?a=?119?18?J?a?2?x+?b+1?y=13 ?T“ x?y ? ?a?20?b+10? ?a2?b?1 ?J?YZE?&?C?e?C?I 0? ? ?I 0? 0? 19?JAC x=y?4x+3y=7 I 4x+3x=7? ?x=1?y=1?w x=1?y= 1 F kx+?k?1?y=3 ? k+k?1=3? ?k=2 ?J?&?C?T?w?&?C?DE?&?C?F?$ F?I? ?V?C?20
6、?J?x?1?2+?2y+1?2=0?x?1=0 ? 2y+1=0?x=?1?y=?1 2?L x=1?y=?1 2M?x?y=1+1 2=3 2(L x=?1?y=?1 2M?x?y=?1+1 2=?1 2?J?_?SI 0? ?x?1?2?2y+1?2?!“ 0?k?x?1=0?2y+1=0?21?J?4 1x y=?1 2x+3y=5 ?c?&?W x?y=3?22?1? ?J ? 0? 8 ?lonv x p? 2 ?lonv y p? hiA13 0.8220xy xy+=+=?2?J? x ?y?y &|?hiA41 5(1)yx yx+ =?23?JYZ?“?J25 28xy xy+=? x+y=25 ?YZ 2x?y=8?“YZ6?&? 2x?y=8 ?W x=10?y=12?YZ?25 28xy xy+=?24?J?K?I?mx=7? ?L m=1 M?x=?7(m=?1 M?x=7(m= 7 M?x=?1(m=?7 M x=1?
