①(-5a-2b)( )=4b^2-25a^2 ②(a-___)^2=a^2-8ab+___
2个回答
①(-5a-2b)(5a-2b )=4b^2-25a^2
②(a-4b)^2=a^2-8ab+16b^2
相关问题
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已知a2-ab=8,ab-b2=-4,则a2-b2=______,a2-2ab+b2=______.