Question

tim x, y biet

x/49=-3/7

b, x-2/12=2/3

c,x-1/9=x+3=15

d,3/x=9/35=-36/84

Answer 1

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Answer 2

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Answer 3

a) x/49 = -3/7

x/49=-21/7

=>x=-21

b)x-2/12=2/3

x-2/12=8/12

=>x-2=8

x=8+2

x=10

Answer 4

\(\dfrac{x}{49}=\dfrac{-3}{7}\)

ta có \(x\cdot7=49\cdot-3\)

hay \(x.7=-147\)

hay\(x=-147:7\)\(\Rightarrow x=-21\)

b) \(x-\dfrac{2}{12}=\dfrac{2}{3}\)

\(x=\dfrac{2}{3}+\dfrac{2}{12}\)

\(x=\dfrac{5}{6}\)

c) \(x-\dfrac{1}{9}=15-3\)

\(x-\dfrac{1}{9}=12\)

\(x=12+\dfrac{1}{9}\)

\(x=\dfrac{109}{9}\)

Answer 5

d)\(\dfrac{3}{x}=\dfrac{9}{35}=\dfrac{-3}{7}\)

ta có: \(x\cdot9\cdot84=3\cdot35\cdot-3\)

\(x\cdot9\cdot84=-3780\)

\(x=-3780:\left(9\cdot7\right)\)

\(x=60\)

Answer 6

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