加减消元法解二元一次方程组
(1)??3x?y?3(2)?
?x?y?22?4x?10y?3.6?3x?4y?16
(3)?(4)?
?3x?y?15
(5)??3x?y?5
?5x?2y?23
(9)??4x?3y?5?4x?6y?14
?2x?y?40(6)?
?9m?2n?3?4n?m??1
(10)?
?5x?4y?6?2x?3y?1?15x?10y?8(7)??
4x?3y?0
?12x?3y?8(11)??
2x?3y?4
?3x?2y?1
?5x?6y?33
8)?
?3x?4y?15
2x?4y?10
?12)?
?3x?2y??1
x?4y??7
?((
?2x?5y??2?7m?3n?1(13)? (14)?x?1??3x?2y?15??2y (15)? (16)?2 ?2n?3m??2
(17)??y?2x
?3y?2x?8
(21)??5x?2y?5a
?3x?4y?3a ?x?3y?818)??x?4y??1?2x?y?16 ?3x?4y?18(22)??1x?y ??2?4?5x?4y?23??2(x?1)?y?719)??x?y?3?3x?2y?5?3x?8y?14 (20)??4x?3y?1 ?112(23)???5x?3y?5 (24)??11x?9y?12?0.5x?0.3y?0.2??4x?3y??5 ( (
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