Question

tim x 

x *  6,5 +140 = 630,1

107,8 - x / 9.5 = 29,2

Answer 1

\(x\)x 6,5+ 140= 630,1.

\(x\)x 6,5= 630,1- 140.

\(x\)x 6,5= 490,1.

\(x\)= 490,1: 6,5.

\(x\)= 75,4.

Vậy \(x\)= 75,4.

b) 107,8- \(x\): 9,5= 29,2.

\(x\): 9,5= 107,8- 29,2.

\(x\): 9,5= 78,6.

\(x\)= 78,6x 9,5.

\(x\)= 746,7.

Vậy \(x\)= 746,7.

Answer 2

\(6,5x+140=630,1\)

\(6,5x=630,1-140\)

\(6,5x=490,1\)

\(x=75,4\)

\(\frac{107,8-x}{9,5}=29,2\)

\(\Rightarrow107,8-x=277,4\)

\(\Rightarrow x=-169,6\)

vậy \(x=-169,6\)

Answer 3

x . 6,5 + 140 = 630,1

x . 6,5 = 630,1 - 140

x . 6,5 = 490,1

x = 490,1 : 6,5 

x = 75,4