Cách làm cho bạn:
Ta có:
a) $1\frac{3}{4} . \frac{−16}{7}$
= $\frac{7}{4} . \frac{−16}{7}$
=$-4$
b) $\12 : \frac{−6}{5}+\frac{1}{5}$;
=$ 12 : \frac{5}{−6}+\frac{1}{5}$
=$-10 + 0,2= -9,8$
c) $\frac{2}{9}+\frac{1}{3}:(\frac{−3}{2})+\frac{1}{2}. (−0,5)$;
= $\frac{2}{9}+\frac{1}{3}:(\frac{−3}{2})+\frac{1}{2}. (−\frac{1}{2})$
=$\frac{-1}{4}$
d) $(0,1)^{21}:(−0,01)^{10}$
= $(0,1)^{21}:(0,01)^{10}$
=$(0,1)^{21}:[(0,1)^{2}]^{10}$
=$(0,1)^{21}:(0,1)^{20}=0,1$
Bình luận