Question

A=15.\(\left(\dfrac{3}{5}-\dfrac{2}{3}\right)+1\)

\(B=1-\dfrac{13}{9}:\dfrac{8}{19}+\dfrac{-11}{9}:\dfrac{8}{19}\)

\(C=\dfrac{-5}{7}.\dfrac{2}{11}+\dfrac{-5}{7}.\dfrac{9}{11}+1\dfrac{5}{7}\)

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

tính giá trị của biểu thức

Answer 1

\(A=15.\left(\dfrac{3}{5}-\dfrac{2}{3}\right)+1\\ A=15.\left(\dfrac{9}{15}-\dfrac{10}{15}\right)+1\\ A=15.\dfrac{-1}{15}+1\\ A=-1+1\\ A=0\)

Answer 2

\(C=\dfrac{-5}{7}.\dfrac{2}{11}+\dfrac{-5}{7}.\dfrac{9}{11}+1\dfrac{5}{7}\\ C=\dfrac{-5}{7}.\dfrac{2}{11}+\dfrac{-5}{9}.\dfrac{9}{11}+\dfrac{12}{7}\\ C=\dfrac{-5}{7}.\left(\dfrac{2}{11}+\dfrac{9}{11}\right)+\dfrac{12}{7}\\ C=\dfrac{-5}{7}.1+\dfrac{12}{7}\\ C=\dfrac{-5}{7}+\dfrac{12}{7}\\ C=1\)

Answer 3

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

Answer 4

\(B=1-\dfrac{13}{9}:\dfrac{8}{19}+\dfrac{-11}{9}:\dfrac{8}{19}\\ B=1-\dfrac{13}{9}.\dfrac{19}{8}+\dfrac{-11}{9}.\dfrac{19}{8}\\ B=1-\dfrac{247}{72}+\dfrac{-209}{72}\\ B=\dfrac{72}{72}-\dfrac{247}{72}+\dfrac{-209}{72}\\ B=\dfrac{-16}{3}\)