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Second grade mathematics (a ^ 2 + AB) / (a ^ 2 + 2Ab + B ^ 2), where a = - 3, B = 2, first reduce, then evaluate
(a^2+ab)/(a^2+2ab+b^2=a(a+b)/[(a+b)^2]=a/(a+b)=(-3)/[(-3)+2[=(-3)/(-1)=3
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