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Bài 2:
\(=\dfrac{28}{25}\cdot\dfrac{15}{7}\cdot5=\dfrac{75}{25}\cdot4=12\)
Bài 1:
a: \(x+\dfrac{7}{8}=\dfrac{13}{2}:4=\dfrac{13}{8}\)
nên x=13/8-7/8=6/8=3/4
b: \(x:\dfrac{5}{3}=\dfrac{6}{5}-\dfrac{2}{3}=\dfrac{18-10}{15}=\dfrac{8}{15}\)
nên \(x=\dfrac{8}{15}\cdot\dfrac{5}{3}=\dfrac{8}{9}\)
a) ( 42- 6) : 1/2 + 7/6
= 36 : 1/2 + 7/6
= 72 + 7/6
= 439/6
b) 18/5 - 2/7 + 1/3
= 383/105
\(\dfrac{9}{5}-\dfrac{3}{4}:\dfrac{5}{6}=\dfrac{9}{5}-\dfrac{9}{10}=\dfrac{9}{10}\)
\(x=\dfrac{7}{9}:\dfrac{5}{7}=\dfrac{49}{45}\)
\(=\dfrac{9}{5}-\dfrac{3}{4}x\dfrac{6}{5}=\dfrac{9}{5}-\dfrac{9}{10}=\dfrac{18}{10}-\dfrac{9}{10}=\dfrac{9}{10}\)
\(x=\dfrac{7}{9}:\dfrac{5}{7}\)
\(x=\dfrac{49}{45}\)
\(\dfrac{7}{5}\times\dfrac{3}{4}:\dfrac{4}{5}=\dfrac{21}{20}:\dfrac{4}{5}=\dfrac{21}{20}\times\dfrac{5}{4}=\dfrac{105}{80}\)
\(x-\dfrac{3}{9}=\dfrac{8}{7}\)
\(x=\dfrac{8}{7}+\dfrac{3}{9}\)
\(x=\dfrac{72}{63}+\dfrac{21}{63}\)
\(x=\dfrac{93}{63}\)
1) \(\dfrac{11}{12}\times\dfrac{28}{13}-\dfrac{11}{12}\times\dfrac{15}{13}=\dfrac{11}{12}\times\left(\dfrac{28}{13}-\dfrac{15}{13}\right)=\dfrac{11}{12}\times\dfrac{13}{13}=\dfrac{11}{12}\times1=\dfrac{11}{12}\)
Vậy biểu thức trên có kết quả là : \(\dfrac{11}{12}\)
2) \(x+653=87\times11\)
\(x+653=957\)
\(x=957-653\)
\(x=304\)
Vậy `x = 304 `
3) \(\text{70 000 + 800 + 20 + 9}=70829\)
A =(1/2:3/2)-(1/2X2/3)
=(1/2X2/3)-(1/2X2/3)
=1/3-1/3
= 0
tik cho mik
\(\dfrac{4}{7}\)
\(\Rightarrow x=\dfrac{2}{5}:\dfrac{7}{10}=\dfrac{2}{5}\times\dfrac{10}{7}=\dfrac{4}{7}\)