亲们~已知xy=-2,x+y=3,求（3xy+10y）+[5x-(2xy+2y-3x)] 的值亲们~这道题之前想了一会,我要试过吧xy=-2代入到后面那个式子里去,本来是打算到最后把x+y=3也代入进去的,但是不管是一开始就代入还是最后
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