a-b=3 ab=2,求 a^2-b^2-6b+1的值

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a-b=3 ab=2,求 a^2-b^2-6b+1的值
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a-b=3 ab=2,求 a^2-b^2-6b+1的值
a-b=3 ab=2,求 a^2-b^2-6b+1的值

a-b=3 ab=2,求 a^2-b^2-6b+1的值
a²-b²-6b+1
=(a+b)(a-b)-6b+1
=3(a+b)-6b+1
=3a+3b-6b+1
=3a-3b+1
=3(a-b)+1
=9+1
=10

a-b=3, ab=2
a²-b²-6b+1=(a-b)(a+b)-6b+1
=3(a+b)-6b+1
=3a+3b-6b+1
...

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a-b=3, ab=2
a²-b²-6b+1=(a-b)(a+b)-6b+1
=3(a+b)-6b+1
=3a+3b-6b+1
=3a-3b+1
=3(a-b)+1
=3×3+1
=10

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a^2-b^2-6b+1
=(a-b)(a+b)-6b+1
=3(a+b)-6b+1
=3a+3b-6b+1
=3a-3b+1
=3(a-b)+1
=3×3+1
=10