只需要列方程，谢谢。

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 棚纳数链首茄闭

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②x十4x=180 ③15x一11x=384 2X=310一2x75

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(2)4x+x=180
(3)(15-11)x=384
(4)(75+x)乘2=310

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2,X+4X=180

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3题:15x十11x=384

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