若a、b满足a^2-3ab+2b^2=6,且a-2b=3,则a-b=?

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若a、b满足a^2-3ab+2b^2=6,且a-2b=3,则a-b=?若a、b满足a^2-3ab+2b^2=6,且a-2b=3,则a-b=?若a、b满足a^2-3ab+2b^2=6,且a-2b=3,则

若a、b满足a^2-3ab+2b^2=6,且a-2b=3,则a-b=?
若a、b满足a^2-3ab+2b^2=6,且a-2b=3,则a-b=?

若a、b满足a^2-3ab+2b^2=6,且a-2b=3,则a-b=?
a^2-3ab+2b^2=6
(a-b)(a-2b)=6
即3(a-b)=6
a-b=2

(a-b)(a-2b)=6
a-2b=3
所以a-b=2

a^2-3ab+2b^2=6
(a-b)(a-2b)=6
a-b=2