Question

3x+5=2
5x+3(x+6)=7x+13
4x-9/3+3x-40/9=2x+5/6+1 întreg5/18

Answer 1

Răspuns:

Explicație pas cu pas:

a) 3x+5=2|-5

3x=-3|:3

x=(-1)

b) 5x+3(x+6)=7x+13

5x+3x+18=7x+13

8x+18=7x+13|-8x

18=-x+13|-13

5=-x

-x=5

x=-5

c) $4x-\frac{9}{3} +3x-\frac{40}{9} =2x+\frac{5}{6} +1\frac{5}{18}$

$4x+3x-3-\frac{40}{9} =2x+\frac{15}{18} +\frac{23}{18} \\\\7x-\frac{27}{9} -\frac{40}{9} =2x+\frac{38}{18}$

$7x-\frac{67}{9} =2x+\frac{38}{18} \\\\7x-2x=\frac{67}{9} +\frac{38}{18} \\\\5x=\frac{134}{18} +\frac{38}{18}\\\\5x=\frac{172}{18} |:5\\\\x=\frac{\frac{172}{18} }{5}$

$x= 1.9(1)$

$x=\frac{86}{45}$

Succes! :)