Tính: a) $\dfrac{-1}2+\dfrac56+\dfrac13$ b) $\dfrac{-3}8+\dfrac74-\dfrac1{12}$ c) $\dfrac35:\left({\dfrac14.\dfrac75}\right)$ d) $\dfrac{10}{11}+\dfrac4{11}:4-\dfrac18$

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