1.Simplify
1 1
- - -
b^2 a^2
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a^2 -b^2
2.Given that (x-1)^2 =9 ,find the value of 3x^2-6x-19
3.Factorize (a^2-zb)^2-(ab-b^2)-2[a*4-b^4-(a-b)(a+b)^3]
4.If the interior angels of apentagon are in the ratio 4:5:6:7:8, find the larest
exterior or angle.
更新1:
If (2x+1)^2-(4x+1)(x-Q) = Px,where P and Q are constants,find the value of P and Q.
