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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) =\(\dfrac{35}{40}+\dfrac{80}{40}-\dfrac{24}{40}+\dfrac{120}{40}=\dfrac{35+80-24+120}{40}=\dfrac{211}{40}\)
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Bài 1:
a: =2/3+7/5=10/15+21/15=31/15
b: =3/4+1/8=6/8+1/8=7/8
c: =225/25+7/25=232/25
d: =5/8+8=64/8+5/8=69/8
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: =20/60+12/60-15/60=17/60
b: =7/8-1/4-2/5=7/8-2/8-2/5=5/8-2/5=25/40-16/40=9/40
c: =5/11-3/5+6/11=1-3/5=2/5
a: \(x+\dfrac{3}{7}=\dfrac{2}{5}+\dfrac{3}{10}=\dfrac{4}{10}+\dfrac{3}{10}=\dfrac{7}{10}\)
\(\Leftrightarrow x=\dfrac{7}{10}-\dfrac{3}{7}=\dfrac{49}{70}-\dfrac{30}{70}=\dfrac{19}{70}\)
b: \(\dfrac{19}{20}-x=\dfrac{8}{5}-\dfrac{3}{4}=\dfrac{32}{20}-\dfrac{15}{20}=\dfrac{17}{20}\)
=>x=19/20-17/20=2/20=1/10
c: \(\dfrac{7}{5}-x\cdot\dfrac{1}{4}=\dfrac{13}{20}\)
\(\Leftrightarrow x\cdot\dfrac{1}{4}=\dfrac{7}{5}-\dfrac{13}{20}=\dfrac{28}{20}-\dfrac{13}{20}=\dfrac{7}{20}\)
=>x=7/5
Gọi số hoa của Hằng và Nga lần lượt là a,b
Theo đề, ta có: a-b=18 và a+6=5/3b
=>a-b=18 và a-5/3b=-6
=>a=54 và b=36
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
CÂU C