a, $\frac{1}{2}$ + $\frac{3}{16}$ + $\frac{-3}{4}$ – $\frac{5}{8}$
b, 21 – 3$\frac{3}{4}$ : ( $\frac{3}{8}$ – $\frac{1}{6}$ )
c, $3^{2}$ . $\frac{1}{243}$ . $81^{2}$ : $3^{3}$
d, ( $\frac{-3}{4}$ {4}$ ) : ( $\frac{-9}{8}$ ){4}$
a, $\frac{1}{2}$ + $\frac{3}{16}$ + $\frac{-3}{4}$ – $\frac{5}{8}$ b, 21 – 3$\frac{3}{4}$ : ( $\frac{3}{8}$ – $\frac{1}{6}$ ) c, $3^{2}$ . $\frac{1}
By Amara
a, $\frac{1}{2}$ +$\frac{3}{16}$ +$\frac{-3}{4}$ -$\frac{5}{8}$
=$\frac{1.8+3-3.4-5.2}{16}$
=$\frac{-11}{16}$
b, 21-3$\frac{3}{4}$ :($\frac{3}{8}$ -$\frac{1}{6}$ )
=21-3$\frac{3}{4}$ :$\frac{3.8-4.1}{24}$
=21-3$\frac{3}{4}$ :$\frac{20}{24}$
= 21-3$\frac{3}{4}$ .$\frac{24}{20}$
=$\frac{33}{2}$
c, 9.$\frac{1}{243}$ .6561:9
=243:9
=27
a, $\frac{1}{2}$ + $\frac{3}{16}$ + $\frac{-3}{4}$ – $\frac{5}{8}$
= $\frac{8 + 3 + (-12) – 10}{16}$
= $\frac{-11}{16}$
b, 21 – 3$\frac{3}{4}$ : ( $\frac{3}{8}$ – $\frac{1}{6}$ )
= 21 – $\frac{15}{4}$ : ( $\frac{9 – 4}{24}$ )
= 21 – $\frac{15}{4}$ : $\frac{5}{24}$
= 21 – $\frac{15. 24}{4. 5}$
= 21 – 18 = 3
c, $3^{2}$ . $\frac{1}{243}$ . $81^{2}$ : $3^{3}$
= $3^{2}$ . $3^{-5}$ . $3^{4}$ : $3^{3}$
= $3^{2 – 5 + 4 – 3}$
= $3^{-2}$
= $\frac{1}{9}$
d, bạn viết không được rõ ràng, nếu bạn sửa lại thì mik sẽ giải luôn
Xin 5* và câu trả lời hay nhất ạ!