对于有理数a,b,定义：a*b=3a-2b,若x,y均为有理数,试计算[(x+y)*(x-y)]*2x
人气：120 ℃ 时间：2019-10-19 07:30:52
解答
[(x+y)*(x-y)]*2x
=[3(x+y)-2(x-y)]*2x
=(x+5y)*2x
=3(x+5y)-2*2x
=-x+15y
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