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(1)代入消元法:2 x + y = 7①x + 2 y = 8②由①得:y = 7 - 2 x③把③代入②得:x + 2(7 - 2 x)= 8 x + 14 - 4 x = 8- 3 x = - 6x = 2代入③得:y = 7 - 2×2 = 7 - 4 = 3∴x = 2,y = 3(2)加…
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