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定义一种新运算:a▲b=2a-b.
(1)直接写出b▲a的结果;
(2)计算:[(x-2y)▲(x+y)]▲3y.
人气:402 ℃ 时间:2019-11-10 19:09:40
解答
(1)原式=2b-a;
(2)原式=[2(x-2y)-(x+y)]▲3y
=(x-5y)▲3y
=2(x-5y)-3y
=2x-13y.
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