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a: =11/4+5/4-9/8
=4-9/8=32/8-9/8=23/8
b: \(=\dfrac{6}{7}\cdot\dfrac{7}{4}+\dfrac{5}{3}=\dfrac{3}{2}+\dfrac{5}{3}=\dfrac{9+10}{6}=\dfrac{19}{6}\)
c: \(=\dfrac{13}{18}\cdot\dfrac{9}{5}-1=\dfrac{13}{10}-1=\dfrac{3}{10}\)
d: \(=3+\dfrac{9}{4}\cdot\dfrac{5}{3}=3+\dfrac{45}{12}=\dfrac{81}{12}=\dfrac{27}{4}\)
A) 3/7 + 4/9 + 4/7 + 5/9 = ( 4/9+5/9) + ( 3/7 + 4/7) = 1+ 1 = 2
B) 1/5 + 4/11 + 4/5 + 7/11 = ( 4/11 + 7/11) + ( 1/5 + 4/5) = 1+1=2
C) 1/15 + 4/15 + 5/18 + 7/18= ( 1/15+4/15) + (5/18+7/15)= 5/15 + 12/15 = 17/15
D) 1/8 + 1/12 + 3/8 + 5/12 = (1/8 + 3/8) + ( 1/12 + 1/12) = 4/8 + 2/12 = 64/96
K nha
\(a,\)\(\frac{13}{18}\div\frac{5}{9}-1\)
\(=\frac{13}{18}\times\frac{9}{5}-1\)
\(=\frac{13}{10}-1\)
\(=\frac{3}{10}\)
\(b,\)\(3+\frac{9}{4}\div\frac{3}{5}\)
\(=\)\(3+\frac{9}{4}\times\frac{5}{3}\)
\(=\)\(3+\frac{15}{4}\)
\(=\frac{27}{4}\)
\(\frac{13}{18}\div\frac{5}{9}-1\)
\(=\frac{13}{10}-1\)
\(=\frac{3}{10}\)
A
A