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a) \(x+\dfrac{4}{5}=\dfrac{45}{5}-\left(\dfrac{3}{7}+\dfrac{3}{5}\right)\)
\(x+\dfrac{4}{5}=\dfrac{45}{5}-\dfrac{36}{35}\)
\(x+\dfrac{4}{5}=\dfrac{279}{35}\)
\(x=\dfrac{279}{35}-\dfrac{4}{5}\)
\(x=\dfrac{251}{35}\)
b) \(\dfrac{5}{8}\times x=\dfrac{4}{5}\)
\(x=\dfrac{4}{5}\div\dfrac{5}{8}\)
\(x=\dfrac{32}{25}\)
a: =(3/5+2/5)+(4/7+1/7+2/7)=1+1=2
b: =(12/13+8/13+6/13)+(2/7+5/7)=2+1=3
a) =\(\dfrac{21}{35}+\dfrac{10}{35}+\dfrac{4}{35}=\dfrac{21+10+4}{35}=\dfrac{35}{35}=1\)
b) =\(\dfrac{16}{24}+\dfrac{15}{24}-\dfrac{12}{24}=\dfrac{19}{24}\)
c) =\(\dfrac{35}{40}+\dfrac{80}{40}-\dfrac{24}{40}+\dfrac{120}{40}=\dfrac{35+80-24+120}{40}=\dfrac{211}{40}\)
a)
= 5/27 + 2/3
= 5/27 + 18/27
= 23/27
b)
= 28/7 - 3/7
= 257
c)
= 14/168
= 1/12
d)
= 3/7 x 1/4
= 3/28
a)
= 5/27 + 2/3
= 5/27 + 18/27
= 23/27
b)
= 28/7 - 3/7
= 257
c)
= 14/168
= 1/12
d)
= 3/7 x 1/4
= 3/28