Question

tính

\(\dfrac{6}{7}+\dfrac{5}{8}:5-\dfrac{3}{16}.\left(-2\right)^2\)

MONG CÁC BẠN GIÚP ĐỠ XIN CẢM ƠN

Answer 1

\(\dfrac{6}{7}+\dfrac{5}{8}:5-\dfrac{3}{16}\cdot\left(-2\right)^2\)

\(=\dfrac{6}{7}+\dfrac{5}{8}\cdot\dfrac{1}{5}-\dfrac{3}{16}\cdot4\\ =\dfrac{6}{7}+\dfrac{1}{8}-\dfrac{3}{4}\\ =\dfrac{13}{56}\)

Answer 2

\(\dfrac{6}{7}+\dfrac{5}{8}:5-\dfrac{3}{16}\cdot\left(-2\right)^2\\ =\dfrac{6}{7}+\dfrac{5}{8}\cdot\dfrac{1}{5}-\dfrac{3}{16}\cdot4\\ =\dfrac{6}{7}+\left(\dfrac{5}{8}\cdot\dfrac{1}{5}\right)-\left(\dfrac{3}{16}\cdot4\right)\\ =\dfrac{6}{7}+\left(\dfrac{1\cdot1}{8\cdot1}\right)-\left(\dfrac{3}{4}\cdot1\right)\\ =\dfrac{6}{7}+\dfrac{1}{8}-\dfrac{3}{4}\\ =\dfrac{48}{56}+\dfrac{7}{56}-\dfrac{42}{56}\\ =\dfrac{48+7-42}{56}\\ =\dfrac{13}{56}\)

Answer 3

\(\dfrac{6}{7}+\dfrac{5}{8}:5-\dfrac{3}{16}.\left(-2\right)^2=\dfrac{6}{7}+\dfrac{1}{8}-\dfrac{3}{16}.4\)

\(=\dfrac{6}{7}+\dfrac{1}{8}-\dfrac{3}{4}=\dfrac{48+7-14}{56}=\dfrac{41}{56}\)