Đáp án:
a.$-\dfrac12$
b.$\dfrac{-44}{-15}$
c.$-10$
d.$-\dfrac5{16}$
Giải thích các bước giải:
a.$\dfrac{-2}7:\dfrac47=\dfrac{-2}7\cdot\dfrac74=-\dfrac12$
b.$\dfrac{-4}5:\dfrac{-3}{11}=\dfrac{-4}5\cdot\dfrac{11}{-3}=\dfrac{-44}{-15}$
c.$4:\dfrac{-2}5=4\cdot\dfrac5{-2}=-10$
d.$\dfrac{15}{-8}:-6=\dfrac{15}{-8}\cdot\dfrac1{6}=-\dfrac5{16}$