Question

Tính giá trị biểu thức sau

a, A= 2/3 - 4 × ( 1/2 + 3/4)

b, B= ( -1/3 + 5/6 ) × 11-7

c, C = 1+4/6 × 1/2 + 6+3/4 + 5-3/3

d, D= ( 4/3 - 2/3 ) × (7/10 - 3/10 ) - 1/5 × ( 8/6 - 7/6 )

Answer 1

a: \(A=\dfrac{2}{3}-4\cdot\dfrac{5}{4}=\dfrac{2}{3}-5=-\dfrac{13}{3}\)

b: \(B=\dfrac{-2+5}{6}\cdot11-7=\dfrac{11}{2}-7=-\dfrac{3}{2}\)

c: \(=1+\dfrac{2}{3}\cdot\dfrac{1}{2}+\dfrac{27}{4}+5-1\)

\(=\dfrac{1}{3}+\dfrac{27}{4}+5=\dfrac{145}{12}\)

d: \(D=\dfrac{2}{3}\cdot\dfrac{2}{5}-\dfrac{1}{5}\cdot\dfrac{1}{6}=\dfrac{4}{15}-\dfrac{1}{30}=\dfrac{7}{30}\)