代入消元法解二元一次方程组
(1)??y?2x?3?2x?3y?8?2x?y?7?3x?2y?5,
(2)? (3)?(4)?
?3x?5y?5 (5)??3x?y?5,
?5x?2y?23;
(9)??
4x?3y?5?4x?6y?14
?x?2y?8(6)??9m?2n?3?4n?m??1(10)??
5x?4y?6
?2x?3y?1 ?y?1?x;
(7)??
4x?3y?0?12x?3y?8
(11) ??
3x?2y?7
?2x?3y?17
?3x?2y?1(8)?
?4x?y?5
?3x?2y?1
?x(12)???
y?x?24y3
?3?18
?3x?4y?18(13)?
?2x?5y??2
(14)?
xy????7
(15)?23
x?1???2y (16)?2
?x?3y?11
(17)??y?2x
?3y?2x?8
(21)??
x?2y?9?3x?y??1
?x?3y?8
18)?
?x?4y??1?2x?y?16
?3x?4y?1822)?
?1
x?y?4 ??2
??2x?y?1419)?
?x?y?3?3x?8y?14
(23)??
3m?2n?16
?2m?3n??1??2(x?1)?y?7
20)?
?x?y?22?2x?y?40
(24)??
m?3n?2
?m?3n?8
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