Question

tính giá trị biểu thức

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

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

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

Answer 1

\(C=\dfrac{6}{7}+\dfrac{5}{8}:5-\dfrac{3}{16}.\left(-2^2\right)\\ C=\dfrac{6}{7}+\dfrac{5}{8}.\dfrac{1}{5}-\dfrac{3}{16}.\left(-4\right)\\ C=\dfrac{6}{7}+\dfrac{1}{8}-\dfrac{3}{16}.\left(-4\right)\\ C=\dfrac{6}{7}+\dfrac{1}{8}-\dfrac{3}{16}.\dfrac{-4}{1}\\ C=\dfrac{6}{7}+\dfrac{1}{8}-\dfrac{-3}{4}\\ C=\dfrac{48}{56}+\dfrac{7}{56}-\dfrac{-42}{56}\\ C=\dfrac{97}{56}\)

Answer 2

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

\(A=15.\dfrac{-1}{15}+1\)

\(A=-1+1\)

\(A=0\)

Answer 3

A=0

B=\(\dfrac{-137}{36}\)

C=\(\dfrac{13}{56}\)

Answer 4

like tôi cái nha cho thêm động lực để làm

Answer 5

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

Answer 6

\(B=1-\dfrac{13}{9}:\dfrac{8}{19}+\dfrac{-11}{9}:\dfrac{8}{9}\\ B=1-\dfrac{13}{9}.\dfrac{19}{8}+\dfrac{-11}{9}.\dfrac{9}{8}\\ B=1-\dfrac{247}{72}+\dfrac{-11}{8}\\ B=\dfrac{-175}{72}+\dfrac{-11}{8}\\ B=\dfrac{-175}{72}+\dfrac{-99}{72}\\ B=\dfrac{-137}{36}\)