Tính các tổng:a)A=\(\frac{a}{\left(a-b\right)\left(a-c\right)}\)+\(\frac{b}{\left(b-a\right)\left(b-c\right)}\)+\(\frac{c}{\left(c-a\right)\left(c-b\right)}\) b) B=\(\frac{a^2}{\left(a-b\right)\left(a-c\right)}\)+\(\frac{b^2}{\left(b-a\right)\left(b-c\right)}\)+\(\frac{c^2}{\left(c-a\right)\left(c-b\right)}\)b)...
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Tính các tổng:
a)A=\(\frac{a}{\left(a-b\right)\left(a-c\right)}\)+\(\frac{b}{\left(b-a\right)\left(b-c\right)}\)+\(\frac{c}{\left(c-a\right)\left(c-b\right)}\)
b) B=\(\frac{a^2}{\left(a-b\right)\left(a-c\right)}\)+\(\frac{b^2}{\left(b-a\right)\left(b-c\right)}\)+\(\frac{c^2}{\left(c-a\right)\left(c-b\right)}\)
b) B=
