Đáp án:
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Giải thích các bước giải:
a) $N=\dfrac{-171717}{232323}=\dfrac{-171717:10101}{232323:10101}=\dfrac{-17}{23}=N\\\Rightarrow M=N$
Vậy $M=N$.
b) $M=\bigg|\!-\!2,75\;\!\bigg|-\dfrac72+\dfrac14\\\Rightarrow M=\left|\dfrac{-11}{4}\right|-\dfrac72+\dfrac14\\\Rightarrow M=\dfrac{11}{4}-\dfrac72+\dfrac14\\\Rightarrow M=3-\dfrac72\\\Rightarrow M=\dfrac{-1}{2}\\N=-\left(\dfrac35+\dfrac34\right)-\left(\dfrac{-3}{4}+\dfrac25\right)\\\Rightarrow N=\dfrac{-3}{5}+\dfrac{-3}4+\dfrac34-\dfrac25\\\Rightarrow N=\left(\dfrac{-3}{5}-\dfrac25\right)+\left(\dfrac{-3}{4}+\dfrac34\right)\\\Rightarrow N=-1<\dfrac{-1}{2}=M\\\Rightarrow M>N$
Vậy $M>N$.
