初二3道因式分解题.1.(x+y)²-10(x+y)+252.a²b²/4-ab+1 3.81a∧4-b∧4请附上过程..

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初二3道因式分解题.1.(x+y)²-10(x+y)+252.a²b²/4-ab+1 3.81a∧4-b∧4请附上过程..
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初二3道因式分解题.1.(x+y)²-10(x+y)+252.a²b²/4-ab+1 3.81a∧4-b∧4请附上过程..
初二3道因式分解题.
1.(x+y)²-10(x+y)+25
2.a²b²/4-ab+1
3.81a∧4-b∧4
请附上过程..

初二3道因式分解题.1.(x+y)²-10(x+y)+252.a²b²/4-ab+1 3.81a∧4-b∧4请附上过程..
1.(x+y)²-10(x+y)+25
=[(x+y)-5]²
=(x+y-2)²
2.a²b²/4-ab+1
=(ab/2)²-2×(ab/2)×1+1²
=((ab/2-1)²
3.81a∧4-b∧4
=(9a²+b²)(9a²-b²)
=(9a²+b²)(3a+b)(3a-b)