(x-y)²+16(x-y)+( )=( )²
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(x-y)²+16(x-y)+( )=( )²
求括号里应填什么?
求括号里应填什么?
![(x-y)²+16(x-y)+( )=( )²](/uploads/image/z/12677585-41-5.jpg?t=%28x-y%29%26%23178%3B%2B16%28x-y%29%2B%28+%29%3D%28+%29%26%23178%3B)
解
(x-y)²+16(x-y)+()=()²
(x-y)²+2×(x-y)×8+8²
=[(x-y)+8]²
=(x-y+8)²
第一个括号填64
第二个括号填(x-y+8)²
再问: 额……确定是对的吗?你的答案和楼下不一样啊……
再答: 哦,第二个括号,应该是x-y+8
(x-y)²+16(x-y)+()=()²
(x-y)²+2×(x-y)×8+8²
=[(x-y)+8]²
=(x-y+8)²
第一个括号填64
第二个括号填(x-y+8)²
再问: 额……确定是对的吗?你的答案和楼下不一样啊……
再答: 哦,第二个括号,应该是x-y+8
(x-y)²+16(x-y)+( )=( )²
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