Question

x : 3,2 + 3,6 = 9,6 : 1,2                  

25,4 + 5 × x = 313,5 + 4,4                            

12,5 × x – 56,5 = 75,8 × 2    

3,84 × x − 4,2 = 22,5 : 1,5                                                                      

22,5 × x = 31,5 × 2,6         

Answer 1

a: x:3,2+3,6=9,6:1,2

=>x:3,2+3,6=8

=>x:3,2=8-3,6=4,4

=>\(x=4,4\cdot3,2=14,08\)

b: \(25,4+5x=313,5+4,4\)

=>\(5x+25,4=317,9\)

=>\(5x=317,9-25,4=292,5\)

=>\(x=\dfrac{292.5}{5}=58,5\)

c: \(12,5\cdot x-56,5=75,8\cdot2\)

=>\(x\cdot12,5-56,5=151,6\)

=>\(x\cdot12,5=151,6+56,5=208.1\)

=>\(x=\dfrac{208.1}{12.5}=16,648\)

d: \(3,84\cdot x-4,2=22,5:1,5\)

=>\(3,84x-4,2=15\)

=>3,84x=15+1,2=16,2

=>x=16,2/3,84=4,21875

e: 22,5*x=31,5*2,6

=>x*22,5=81,9

=>x=81,9/22,5=3,64