(x+y)@(x-y)
=2(x+y)-(x-y)
=x+3y
[(x+y)@(x-y)]@(x-2y)
=(x+3y)@(x-2y)
=2(x+3y)-(x-2y)
=x+8y
x=3,y=5/2,
所以:
[(x+y)@(x-y)]@(x-2y)
=x+8y
=3+8×5/2
=23
敬请及时采纳,回到你的提问页,点击我的回答,然后右上角点击“评价”,然后就可以选择“满意,问题已经完美解决”了.
你有问题也可以在这里向我提问:
(x+y)@(x-y)
=2(x+y)-(x-y)
=x+3y
[(x+y)@(x-y)]@(x-2y)
=(x+3y)@(x-2y)
=2(x+3y)-(x-2y)
=x+8y
x=3,y=5/2,
所以:
[(x+y)@(x-y)]@(x-2y)
=x+8y
=3+8×5/2
=23
敬请及时采纳,回到你的提问页,点击我的回答,然后右上角点击“评价”,然后就可以选择“满意,问题已经完美解决”了.
你有问题也可以在这里向我提问: