Question

Tìm số tự nhiên x biết :

a) 541 + ( 281 - x ) =735

b) 5.(x+35) = 515

c) 96 - 3.( 9x+1) =42

d) 12x - 33 = 3 mũ 2 . 3 mũ 3

Answer 1

a) 541 + ( 281 - x ) =735

=>281-x=735-541

=>281-x=194

=>x=87

b)5.(x+35) = 515

=>x+35=515:5

=>x+35=103

=>x=68

c)96 - 3.( 9x+1) =42

=>3(9x+1)=96-42

=>3(9x+1)=54

=>9x+1=18

=>9x=17

=>x=17/9

d)12x-33=3²*3³

=>12x-33=9*27

=>12x-33=243

=>12x=276

=>x=23

Answer 2

a 24

b 68

c 17

d 23

Answer 3

a) \(541+\left(281-x\right)=735\)

\(\Rightarrow281-x=735-541\)

\(\Rightarrow x=281-194\)

\(\Rightarrow x=87\)

b) \(5\cdot\left(x+35\right)=515\)

\(\Rightarrow x+35=515:5\)

\(\Rightarrow x=103-35\)

\(\Rightarrow x=68\)

c) \(96-3\cdot\left(9x+1\right)=42\)

\(\Rightarrow3\cdot\left(9x+1\right)=96-42\)

\(\Rightarrow9x+1=54:3\)

\(\Rightarrow9x=18-1\)

\(\Rightarrow x=17:9\)

\(\Rightarrow x=\frac{17}{9}\)

d) \(12x-33=3^2\cdot3^3\)

\(=12x-33=243\)

\(\Rightarrow12x=243+33\)

\(\Rightarrow x=276:12\)

\(\Rightarrow x=23\)

Answer 4

vIẾT MŨ KIỂU J Z tHẮNG nGUYỄN