Question

ai giúp mình vs 

a) x - 1/4=5/8.2/3

b) x/126= -5/9.4/7

ai giúp mình, mình tíc 3 tíc nè

Answer 1

a;x=2/3

b=x=-40   nhớ k nha

Answer 2

ta có:\(x-\frac{1}{4}=\frac{5}{8}\cdot\frac{2}{3}\)

=>\(x-\frac{1}{4}=\frac{5}{12}\)

=>\(\frac{2}{3}\)

b)\(\frac{x}{126}=\frac{-20}{63}\)

=>\(\frac{x}{126}=\frac{-40}{126}\)

=>x=-40

Answer 3

trình bày lun mk ms

Answer 4

a)x-1/4=5/12
x=5/12+3/12
x=2/3
b)x/126=-20/63
x=(-20/63)*126
x=-40

Answer 5

a)x=\(\frac{2}{3}\)

b)x=-40

Answer 6

a)\(x-\frac{1}{4}=\frac{5}{8}.\frac{2}{3}\)

\(x-\frac{1}{4}=\frac{5}{12}\)

\(x=\frac{5}{12}+\frac{1}{4}\)

\(x=\frac{2}{3}\)

b)\(\frac{x}{126}=\left(\frac{-5}{9}\right).\frac{4}{7}\)

\(\frac{x}{126}=\frac{-20}{63}\)

\(\Rightarrow x.63=\left(-20\right).126\)

\(\Rightarrow x.63=\left(-2520\right)\)

\(\Rightarrow x=\left(-2520\right):63\)

\(\Rightarrow x=\left(-40\right)\)