Question

Znajdź liczbę x Jeśli a) |x|=1 1/4 - 0,2 b) |x|=3,75+1/2 c) |x|=3/5+4 d) |x|-1/3=2/3 e) |x|+5/6=1 2/3 f) |x|+1/7=4/7+1/7

Answer 1

a) 

I x I = 1  1/4 - 0,2

I x I = 1,25 - 0,2 = 1,05

x = - 1,05   lub  x = 1,05

===========================

b)

I x I = 3,75 + 1/2

I x I = 3,75 + 0,5 = 4,25

x = - 4,25   lub  x = 4,25

=========================

c)

I x I = 3/5 + 4

( x I = 4  3/5

x = - 4  3/5  lub  x = 4  3/5

==========================

d) I x I - 1/3 = 2/3

I x I = 2/3 + 1/3 = 1

x = - 1   lub  x = 1

==================

e)

I x I + 5/6 = 1  2/3

I x I = 1  4/6 - 5/6

I x I = 5/6

x = - 5/6  lub  x = 5/6

=====================

f)

I x I + 1/7 = 4/7 + 1/7

I x I = 4/7

x = - 4/7    lub  x = 4/7

=========================