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\(\frac{a}{18}=\frac{4}{3}\Rightarrow a.3=4.18\Rightarrow a=\frac{4.18}{3}=4.6=24\)
\(\frac{20}{b}=\frac{4}{3}\Rightarrow b.4=20.3\Rightarrow b=\frac{20.3}{4}=5.3=15\)
\(\frac{c}{21}=\frac{4}{3}\Rightarrow c.3=21.4\Rightarrow c=\frac{21.4}{3}=7.4=28\)
Vậy a = 24;b = 15; c = 28.
\(\frac{a}{18}=\frac{4}{3}\Rightarrow3.a=4.18\Rightarrow a=24\)
\(\frac{24}{18}=\frac{20}{b}\Rightarrow24.b=20.18\Rightarrow b=15\)
\(\frac{20}{15}=\frac{c}{21}\Rightarrow15.c=20.21\Rightarrow c=28\)
Vậy a=24; b=15;b=28
\(A=\frac{-5x}{21}+\frac{-5y}{21}+\frac{-5o}{21}=-\frac{5}{21}\left(x+y+o\right)\)
\(=-\frac{5}{21}\left(-o+o\right)=0\)
a)
13/36 + 17/45 + -23/20
= 133/180 + -23/20
= -37/90
b)
18/35 + -11/21 + -23/20
= -1/105 + -23/20
= -487/420
bài 1b)
\(8\frac{1}{14}-6\frac37\)
C1:\(\frac{113}{14}-\frac{45}{7}\) =\(\frac{113}{14}-\frac{90}{14}=\frac{23}{14}\)
C2:\(8\frac{1}{14}-6\frac37=\left(8-6\right)+\left(\frac{1}{14}-\frac37\right)=2+\left(\frac{1}{14}-\frac{6}{14}\right)\)
\(=2+\frac{-5}{14}=\frac{28}{14}-\frac{5}{14}=\frac{23}{14}\)
bài 1 c)\(7-3\frac67\)
C1:\(\) \(7-3\frac67=7-\frac{27}{7}=\frac{49}{7}-\frac{27}{7}=\frac{22}{7}\)
C2:\(7-3\frac67=\left(7-3\right)-\frac67=4-\frac67=\frac{28}{7}-\frac67=\frac{22}{7}\)
a=24 ; b=15 ; c=28
TÍCH NHANH NHA !