Question

tìm x: biết :

 ( 2 4/5 .X-50) :2/3 = 51

2/3 X = 5/12 

-2/3 X + 1/5 = 3/10

5 4/7 : X =13

Answer 1

\(2\frac{4}{5}.x-50:\frac{2}{3}=51\)

\(\frac{14}{5}.x-50:\frac{2}{3}=51\)

\(\frac{14}{51}.x=51+50:\frac{2}{3}\)

\(\frac{14}{51}.x=51+75\)

\(\frac{14}{51}.x=126\)

\(x=126:\frac{14}{51}\)

x=459

Vậy x=459

Answer 2

\(\frac{2}{3}.x=\frac{5}{12}=>x=\frac{5}{12}:\frac{2}{3}=\frac{5.3}{12.2}=\frac{15}{24}\)=\(\frac{3}{8}\)

vậy x=3/8

Answer 3

\(-\frac{2}{3}.x+\frac{1}{5}=\frac{3}{10}nên-\frac{2}{3}.x=\frac{3}{10}-\frac{1}{5}\)

\(-\frac{2}{3}x=\frac{1}{10}nênx=\frac{1}{10}:-\frac{2}{3}=-\frac{3}{20}\)

Vậy x=-3/20

Answer 4

\(5\frac{4}{7}:x=13nên\frac{39}{7}:x=13nênx=\frac{39}{7}:13=\frac{39}{7.13}=\frac{39}{91}\)

Vậy x=39/91

Answer 5

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Answer 6

Câu 1:vậy x=459

Câu 2:vậy x=3/8

Câu 3:vậy x=-3/20

Câu 4:vậy x=39/91