若 a^2+2ab+2b^2-6b+9=0,求a^b的值
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若a/b=2 则a*a-ab+b*b/a*a+b*b等于?
(a+ab)-[(ab-2b)-a]-(-9ab),其中a+b=-7,ab=3.
若a/b=2,求分式a*a+ab-b*b/a*a-2ab+2b*b
若a+b=3,ab=-2,求(5a-5b-ab)-(4a-6b-3ab)
若ab^2=-6,则-ab(a^2b^5-ab^3-b)=?
急.如果a*a-ab=9,ab-b*b=4.求a*a-b*b和a*a-2ab+b*b的值
(9a²-6ab+b²)/(3a²-ab),其中b/a=2
a^2b(a-b)-6ab(b-a),
a+b/2ab
2AB/A+B
a+b/2ab
4ab/b^2(a-b)=
若a^2-ab=9,ab+b^2=6,则a^2+b^2=(),a^2-2ab-b^2=(),
若a^2-ab=9,ab-b^2=6,则a^2-b^2=____,a^2-2ab+b^2=____.
若a+b=5,ab=6则-2a^2b-2ab^2
若a²-ab=9,ab-b=6,则a²-b²=_ a²-2ab+b²=_.
a/b=2 ,(a*a-ab+b*b)/(a*a+b*b)=
若a-b=6,ab=7,则ab^2-a^2b