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a: =4/5+1/5+2/3+1/3=1+1=2
b: =17/12+7/12+29/7-8/7=3+2=5
c: =3/5+2/5+16/7-1/7-1/7
=1+2=3
d: =2/5+3/5+2/3+1/3+7/4+1/4
=1+1+2
=4
a)
`7/12+x=3/2`
`=>x=3/2-7/12`
`=>x=18/12-7/12`
`=>x=11/12`
b)
`1/7:x=1/3`
`=>x=1/7:1/3`
`=>x=1/7xx3`
`=>x=3/7`
a)7/12+x=3/2
X=3/2-7/12
X=11/12
B)1/7:x=1/3
X=1/7:1/3
X=3/7
a)
`7/12+x=3/2`
`=>x=3/2-7/12`
`=>x=18/12-7/12`
`=>x=11/12`
b)
`1/7:x=1/3`
`=>x=1/7:1/3`
`=>x=1/7xx3`
`=>x=3/7`
\(\dfrac{13}{7}+\dfrac{5}{6}+\dfrac{2}{7}+\dfrac{7}{6}=\dfrac{15}{7}+\dfrac{12}{6}=\dfrac{29}{7}\)
\(\dfrac{1}{2}\times\dfrac{5}{6}+\dfrac{1}{2}\times\dfrac{11}{6}=\dfrac{1}{2}\times\left(\dfrac{5}{6}+\dfrac{11}{6}\right)=\dfrac{1}{2}\times\dfrac{16}{6}=\dfrac{4}{3}\)
\(\dfrac{9}{5}+\dfrac{5}{7}+\dfrac{7}{5}+\dfrac{3}{7}=\left(\dfrac{9}{5}+\dfrac{7}{5}\right)+\left(\dfrac{5}{7}+\dfrac{3}{7}\right)=\dfrac{16}{5}+\dfrac{8}{7}=\dfrac{112}{35}+\dfrac{40}{35}=\dfrac{152}{35}\)
\(\dfrac{1}{2}\times\dfrac{45}{33}\times\dfrac{1}{9}\times\dfrac{11}{6}=\dfrac{1}{2}\times\dfrac{15}{11}\times\dfrac{1}{9}\times\dfrac{11}{6}=\left(\dfrac{1}{2}\times\dfrac{1}{9}\right)\times\left(\dfrac{15}{11}\times\dfrac{11}{6}\right)=\dfrac{1}{18}\times\dfrac{15}{6}=\dfrac{5}{36}\)
\(\dfrac{2}{3}x\dfrac{3}{4}x\dfrac{4}{5}x5=\dfrac{2x3x4x5}{3x4x5}=2\)
a) Các phân số đảo ngược là:
\(\dfrac{5}{8}\rightarrow\dfrac{8}{5};\dfrac{3}{4}\rightarrow\dfrac{4}{3};\dfrac{1}{2}\rightarrow\dfrac{2}{1}=2\)
b) \(\dfrac{3}{7}:\dfrac{5}{8}=\dfrac{3}{7}\times\dfrac{8}{5}=\dfrac{24}{35}\)
\(\dfrac{8}{7}:\dfrac{3}{4}=\dfrac{8}{7}\times\dfrac{4}{3}=\dfrac{32}{21}\)
\(\dfrac{1}{3}:\dfrac{1}{2}=\dfrac{1}{3}\times2=\dfrac{2\times1}{3}=\dfrac{2}{3}\)
`5/7 : 1/2`
`=5/7 xx 2`
`=(5xx2)/7`
`=10/7`
\(\dfrac{5}{7}\): \(\dfrac{1}{2}\) = \(\dfrac{5}{7}\)x \(\dfrac{2}{1}\) = \(\dfrac{10}{7}\)