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二元一次方程组解法训练二元一次方程组解法训练命题:李老师 学生:周咏霖(1) (2) 1)(5)(2 21)(7)(6yxyxyxyx 2557 55 31xyyxx(3) (4) 42-3 1223yxyx 021 41 13yxyx(5) (代入法) (6) (代入法) 82 5yxyx 823 02yxyx(7) (8) 2)(5)(4632 yxyxyxyx021 4143yxyx(9) (10) 04235132423512yxyx 57326231732623yxyxyxyx(11) (代入法) (12)(代入法) . 05,1323 nmnm yxyx 2113, 23(13) (14) 1323241yxxy24121232432321yxyx(15)(代入法) (16)(代入法) . 53, 1 yxyx . 643, 02 baba