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a, (27,5 x 0,1 + 2,5 x 0,1) x 2
=(0,1 x (2,5+27,5)) x 2
=(0,1 x 30) x 2
=3 x 2
=6
b, 82,37 + 36 + 63 x 82,37 + 82,37
Khó quá ! chắc bạn chép sai đề
c, (27,54 x 1,1 - 279,24 x 0,1) : 0,3
hình nhưu lại sai đề
1 : ( 0,3 + x ) = 5\(\frac{1}{2}\). 1/4
1 : ( 0,3 + x ) = 11/2 . 1/4
1 : ( 0,3 + x ) = 11/8
0,3 + x = 1 : 11/8
0,3 + x = 8/11
x = 8/11 - 0,3
x = 47/110
A) \(x-\dfrac{2}{3}=\dfrac{4}{5}\\ x=\dfrac{4}{5}+\dfrac{2}{3}\)
\(x=\dfrac{22}{15}\)
b)\(\dfrac{7}{9}-x=\dfrac{1}{3}\\ x=\dfrac{7}{9}-\dfrac{1}{3}\\ x=\dfrac{4}{9}\)
C)\(x:\dfrac{2}{3}=\dfrac{9}{8}\\ x=\dfrac{9}{8}x\dfrac{2}{3}\\ x=\dfrac{3}{4}\)
\(a,x=\dfrac{13}{2}-2\\ x=\dfrac{9}{2}\\ b,x=\dfrac{4}{5}\times\dfrac{3}{4}\\ x=\dfrac{12}{20}=\dfrac{3}{5}\)
a: \(x+\dfrac{3}{9}=\dfrac{7}{6}\cdot\dfrac{2}{3}\)
=>\(x+\dfrac{1}{3}=\dfrac{14}{18}=\dfrac{7}{9}\)
=>\(x=\dfrac{7}{9}-\dfrac{1}{3}=\dfrac{7}{9}-\dfrac{3}{9}=\dfrac{4}{9}\)
b: \(x-\dfrac{2}{3}=\dfrac{1}{8}:\dfrac{5}{4}\)
=>\(x-\dfrac{2}{3}=\dfrac{1}{8}\cdot\dfrac{4}{5}=\dfrac{1}{10}\)
=>\(x=\dfrac{1}{10}+\dfrac{2}{3}=\dfrac{3+20}{30}=\dfrac{23}{30}\)
a) \(\dfrac{4}{x}=\dfrac{2}{9}\)
\(x=\dfrac{\left(4\times9\right)}{2}\)
\(x=\dfrac{36}{2}\)
\(x=18\)
b) \(x\times0,3=\dfrac{3}{5}\)
\(x\times\dfrac{3}{10}=\dfrac{3}{5}\)
\(x=\dfrac{3}{5}:\dfrac{3}{10}\)
\(x=\dfrac{3}{5}\times\dfrac{10}{3}\)
\(x=\dfrac{30}{15}\)
\(x=2\)
c) \(1,1=\dfrac{3}{4}\) câu này thiếu
d) \(121,8:x=\dfrac{5}{9}\)
\(\dfrac{609}{5}:x=\dfrac{5}{9}\)
\(x=\dfrac{609}{5}:\dfrac{5}{9}\)
\(x=\dfrac{609}{5}\times\dfrac{9}{5}\)
\(x=\dfrac{5481}{25}\)
c) \(x:1,1=\dfrac{3}{4}\)
\(x:\dfrac{11}{10}=\dfrac{3}{4}\)
\(x=\dfrac{3}{4}\times\dfrac{11}{10}\)
\(x=\dfrac{33}{40}\)