Question

A)X x 2 +X x 0,5 =10

\(\frac{4}{7}\)+\(\frac{3}{7}\):  X =\(\frac{3}{2}\)

 

Answer 1

\(x\times2+x\times0,5=10\)

\(\Rightarrow x\times\left(2+0,5\right)=10\)

\(\Rightarrow x\times2,5=10\)

\(\Rightarrow x=10\div2,5\)

\(\Rightarrow x=4\)

Vậy x = 4 

\(\frac{4}{7}+\frac{3}{7}\div x=\frac{3}{2}\)

\(\Rightarrow\frac{3}{7}\div x=\frac{3}{2}-\frac{4}{7}\)

\(\Rightarrow\frac{3}{7}\div x=\frac{21}{14}-\frac{8}{14}\)

\(\Rightarrow\frac{3}{7}\div x=\frac{13}{14}\)

\(\Rightarrow x=\frac{3}{7}\div\frac{13}{14}\)

\(\Rightarrow x=\frac{3}{7}\cdot\frac{14}{13}=\frac{6}{13}\)

Vậy x = \(\frac{6}{13}\)

Answer 2

x.2+x.0,5=10

=> x= . (2+0,5)=10

=>x.2,5=10

=>x= 10:2,5

=>x=4

vậy x = 4

b)

\(\frac{4}{7}\)+\(\frac{3}{7}\):x=\(\frac{3}{2}\)

=>  \(\frac{3}{7}\):x= \(\frac{3}{2}\):\(\frac{4}{7}\)

=>  \(\frac{3}{7}\):x=\(\frac{13}{14}\)

=>    \(\frac{3}{7}\):x=\(\frac{3}{7}\):\(\frac{14}{13}\)

=>   x     =\(\frac{6}{13}\)

vậy x =\(\frac{6}{13}\)

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Answer 3

x.2+x.0,5=10

=> x= . (2+0,5)=10

=>x.2,5=10

=>x= 10:2,5

=>x=4

vậy x = 4

b)

\(\frac{4}{7}\)+\(\frac{3}{7}\):x=\(\frac{3}{2}\)

=>  \(\frac{3}{7}\):x= \(\frac{3}{2}\):\(\frac{4}{7}\)

=>  \(\frac{3}{7}\):x=\(\frac{13}{14}\)

=>    \(\frac{3}{7}\):x=\(\frac{3}{7}\):\(\frac{14}{13}\)

=>   x     =\(\frac{6}{13}\)

vậy x =\(\frac{6}{13}\)

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