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\(x+\frac{2}{3}=2\frac{1}{2}\)
\(x+\frac{2}{3}=\frac{5}{2}\)
\(x=\frac{5}{2}-\frac{2}{3}\)
\(x=\frac{11}{6}\)
\(8,75.x+1,25.x=26,3\)
\(x.\left(8,75+1,25\right)=26,3\)
\(x.10=26,3\)
\(x=26,3\div10\)
\(x=2,63\)
\(1-\left(5\frac{4}{9}+y-7\frac{7}{18}\right):15\frac{3}{4}=0\)
\(1-\left(\frac{49}{9}+y-\frac{133}{18}\right):\frac{63}{4}=0\)
\(1-\left(\frac{49}{9}+y-\frac{133}{18}\right)\times\frac{4}{63}=0\)
\(1-\frac{28}{81}-y\times\frac{4}{63}+\frac{38}{81}=0\)
\(1+\frac{38}{81}-\frac{28}{81}-y\times\frac{4}{63}=0\)
\(1+\frac{10}{81}-y\times\frac{4}{63}=0\)
\(\frac{91}{81}-y\times\frac{4}{63}=0\)
\(y\times\frac{4}{63}=\frac{91}{81}\)
\(y=\frac{91}{81}:\frac{4}{63}\)
\(y=\frac{637}{36}\)
P/s : Số hơi to
\(1-\left(5\frac{4}{9}+y-7\frac{7}{18}\right):15\frac{3}{4}=0\)
\(\Rightarrow1-\left(\frac{49}{9}+y-\frac{133}{18}\right):\frac{63}{4}=0\)
\(\Rightarrow\left(\frac{98}{18}+y-\frac{133}{18}\right):\frac{63}{4}=1-0\)
\(\Rightarrow\left(-\frac{35}{18}+y\right):\frac{63}{4}=1\)
\(\Rightarrow-\frac{35}{18}+y=1\times\frac{63}{4}\)
\(\Rightarrow\frac{-35}{18}+y=\frac{63}{4}\)
\(\Rightarrow y=\frac{63}{4}--\frac{35}{18}\)
\(\Rightarrow y=\frac{63}{4}+\frac{35}{18}\)
\(\Rightarrow y=\frac{637}{36}\)
Vậy \(y=\frac{637}{36}\)
Bài 1:
a) \(2\)\(\dfrac{2}{3}\)\(=\dfrac{8}{3}\)
b) \(1\)\(\dfrac{5}{7}=\dfrac{12}{7}\)
bài2 \(x\times\dfrac{15}{16}-x\times\dfrac{4}{16}=2\)
\(x\times\dfrac{11}{16}=2\)
\(x=2:\dfrac{11}{16}\)
\(x=\dfrac{32}{11}\)
Bài 1 :
\(\dfrac{x}{16}\times\left(2017-1\right)=2\)
\(\dfrac{x}{16}\times2016=2\)
\(\dfrac{x}{16}=\dfrac{2}{2016}\)
\(x=\dfrac{2}{2016}\times16\)
\(x=\dfrac{1}{63}\)
\(a,1\dfrac{4}{7}.3\dfrac{4}{11}.3\dfrac{11}{15}.5\dfrac{5}{8}\)
\(=\dfrac{11}{7}.\dfrac{27}{11}.\dfrac{56}{15}.\dfrac{45}{8}\)
\(=\dfrac{11.27.56.45}{7.11.15.8}\)
\(=\dfrac{1.3.7.3}{1.1.1.1}\)
\(=63\)
\(b,\dfrac{3}{4}.1\dfrac{1}{2}+\dfrac{3}{4}.\dfrac{1}{2}\)
\(=\dfrac{3}{4}.\left(1\dfrac{1}{2}+\dfrac{1}{2}\right)\)
\(=\dfrac{3}{4}.2\)
\(=\dfrac{3}{2}\)
\(4\frac{5}{7}:1=\frac{33}{7}:1==\frac{33}{7}\)
\(\frac{5}{6}+2=\frac{5}{6}+\frac{12}{6}=\frac{17}{6}\)
\(\frac{7}{15}x\frac{21}{74}=\frac{7}{3x5}x\frac{3x7}{74}=\frac{7x7}{5x74}=\frac{49}{370}\)
\(2\frac{2}{5}\) x \(\frac{25}{18}\) = \(\frac{12}{5}x\frac{25}{18}=\frac{10}{3}\) x = nhân
\(\frac{9}{11}:2\frac{5}{2}x2\frac{3}{4}\) = \(\frac{9}{11}:\frac{9}{2}x\frac{11}{4}=\frac{2}{11}x\frac{11}{4}=\frac{1}{2}\)
\(10:\frac{35}{24}:\frac{36}{7}=\frac{48}{7}:\frac{36}{7}=\frac{4}{3}\)
\(10,77x9,8+5,23x9,8=\left(10,77+5,23\right)x9,8=156,8\)
\(1,26x3,6:0,28-6,2=4,536:0,28-6,2=16,2-6,2=10\)
\(x=\frac{3121}{180}\)
x=\(\frac{3121}{180}\)