[(x+2y)²-﹙x-y﹚﹙x+2y﹚-5y²]÷﹙2y﹚²等于多少
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[(x+2y)²-﹙x-y﹚﹙x+2y﹚-5y²]÷﹙2y﹚²等于多少
[(x+2y)²-﹙x-y﹚﹙x+2y﹚-5y²]÷﹙2y﹚²等于多少
[(x+2y)²-﹙x-y﹚﹙x+2y﹚-5y²]÷﹙2y﹚²等于多少
[(x+2y)²-﹙x-y﹚﹙x+2y﹚-5y²]÷﹙2y﹚²
=(x²+4xy+4y²-x²-xy+2y²-5y²)÷4y²
=(3xy+y²)÷4y²
=(3x+y)/4y