Question

a)X+X nhân1/4:2/7+X2/9=255

b)2/3+1/3 nhân X+11/3 nhân X =2014

EM ĐG CẦN GẤP Ạ

Answer 1

A=\(\dfrac{18360}{151}\)

B=\(\dfrac{1510}{3}\)

Answer 2

*Giải bằng casio

Answer 3

ghi phép tính đầy đủ ạ

 

Answer 4

a) \(x+x\times\dfrac{1}{4}:\dfrac{2}{7}+x\times\dfrac{2}{9}=255\)

\(x+x\times\dfrac{7}{8}+x\times\dfrac{2}{9}=255\)

\(x\times\left(1+\dfrac{7}{8}+\dfrac{2}{9}\right)=255\)

\(x\times\dfrac{151}{72}=255\)

\(x=255:\dfrac{151}{72}\)

\(x=\dfrac{18360}{151}\)

Em viết lại đề cho chuẩn hơn đi chỗ x2/9

b) \(\dfrac{2}{3}+\dfrac{1}{3}\times x+\dfrac{11}{3}\times x=2014\)

\(\dfrac{1}{3}\times x+\dfrac{11}{3}\times x=2014-\dfrac{2}{3}\)

\(x\times\left(\dfrac{1}{3}+\dfrac{11}{3}\right)=\dfrac{6040}{3}\)

\(x\times4=\dfrac{6040}{3}\)

\(x=\dfrac{6040}{3}:4\)

\(x=\dfrac{1510}{3}\)

Answer 5

a,

$x+x\times \frac{1}{4}÷\frac{2}{7}+x÷\frac{2}{9}=255$

$\Rightarrow x+x\times \frac{1}{4}\times \frac{7}{2}+x\times \frac{9}{2}=255$

$\Rightarrow x+x\times \frac{7}{8}+x\times \frac{9}{2}=255$

$\Rightarrow x.\left(1+\frac{7}{8}+\frac{9}{2}\right)=255$

$\Rightarrow x\cdot \frac{51}{8}=255$

$\Rightarrow x=255÷\frac{51}{8}$

$\Rightarrow x=255\times \frac{8}{51}$

$\Rightarrow x=40$

Vậy x = 40