(6a-4b)(4a-6b)=2*(3a-2b)2*(2a-3b)=4(3a-2b)(2a-3b)
1.25(a-b)^2-(a+b)^2 =(5(a-b)+a+b)(5(a-b)-a-b) =(
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相关问题
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5a+6b=25 a= b=5a+6b=25 a= b=
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a5+b5?a+b=1 a²+b²=2
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(—2a²-5b)( )=4a²-25b²,