Question

gấp ạ

Answer 1

Lời giải:

$A=2^{-3}+5^6.5^{-3}+4^{-3}.4^2-2.3^2-105$

$=2^{-3}+5^3+4^{-1}-18-105$

$=\frac{1}{8}+125+\frac{1}{4}-18-105=\frac{3}{8}+2=2\frac{3}{8}$

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$B=(2^3:2^2).\frac{2}{3}+\frac{8}{16}-7.1+19$

$=2.\frac{2}{3}+\frac{1}{2}-7+19$

$=\frac{4}{3}+\frac{1}{2}+12=1\frac{5}{6}+12=13\frac{5}{6}$