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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
25/9-2=25/9-18/9=7/9
4-5/7=28/7-2/7=26/7
189/45-2=189/45-90/45=99/45
6-1515/1818=6-15/18=6-5/6=36/6-5/6=31/6
a: =8/5-2/3=24/15-10/15=14/15
b: =3/5-1/3=9/15-5/15=4/15
c: =1/3-1/5=5/15-3/15=2/15
d: =6/7-4/9=54/63-28/63=26/63
a) \(4590:\left(x-24+14\right)=30\)
\(x-24+14=4590:30\)
\(x-24+14=153\)
\(x-24=153-14\)
\(x-24=139\)
\(x=139+24\)
\(x=163\)
b) \(61\times\left(126:x\right)=1281\)
\(126:x=1281:61\)
\(126:x=21\)
\(x=126:21\)
\(x=6\)
a) 4590 ÷ ( x− 24 + 14 ) = 30
4590 ( x- 10 ) = 30
x - 10 = 4590 : 30
x-10 = 153
x = 153+10
x = 163