Question

Tìm x, biết:

a.   x – 1/4 = 2/15

b.   x – 7/12 = 17/18 – 1/9

c.   x/45 = 5/6 + -29/30

 

 

Answer 1

\(a.\)\(x-\frac{1}{4}=\frac{2}{15}\)

 \(x=\frac{2}{15}+\frac{1}{4}\)

\(x=\frac{8}{60}+\frac{15}{60}\)

\(x=\frac{23}{60}\)

\(b.\)\(x-\frac{7}{12}=\frac{17}{18}-\frac{1}{9}\)

\(x-\frac{7}{12}=\frac{17}{18}-\frac{2}{18}\)

\(x-\frac{7}{12}=\frac{15}{18}\)

\(x=\frac{15}{18}+\frac{7}{12}\)

\(x=\frac{180}{216}+\frac{126}{216}\)

\(x=\frac{306}{216}=\frac{17}{12}\)

\(c.\)\(\frac{x}{45}=\frac{5}{6}+\left(-\frac{29}{30}\right)\)

\(\frac{x}{45}=\frac{25}{30}+\left(-\frac{29}{30}\right)\)

\(\frac{x}{45}=-\frac{4}{30}=-\frac{2}{15}\)

\(x=-\frac{2}{15}\times45\)

\(x=\frac{-2\times45}{15}\)

\(x=-\frac{90}{15}=-6\)

Answer 2

a)23/60

b)17/12

c)-6/45

Answer 3

Đáp án:

\(a.\)\(x=\frac{23}{60}\)

\(b.\)\(x=\frac{17}{12}\)

\(c.\)\(x=-6\)

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Answer 4

a)

\(x-\frac{1}{4}=\frac{2}{15}\)

\(x=\frac{2}{15}+\frac{1}{4}\)

\(x=\frac{23}{60}\)

b)

\(x-\frac{7}{12}=\frac{17}{18}-\frac{1}{9}\)

\(x-\frac{7}{12}=\frac{5}{6}\)

\(x=\frac{5}{6}+\frac{7}{12}\)

\(x=\frac{17}{12}\)

Answer 5

1/x-1/4=2/15

x       =2/15+1/4

x       =23/60

2/x-7/12=17/18-1/9

x-7/12  =17/18

x         =17/18+7/12

x          =17/12