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|| -2-5 y=-7 -5y=-5 y=1 1 5.已知299x+399y+99=499,則2.99x+3.99y+99= 103 。

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299x + 399y + 99 = 499
=> 299x + 399y = 400
=> 2.99x + 3.99y = 4
=> 2.99x + 3.99y + 99 = 103

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