Odpowiedź:
a) 0,5*( x + 4 + x)*5=20
( x + 2)* 5 = 20 / : 5
x + 2 = 4
x = 4 - 2 = 2
=============
b) 2 x + 2*( 3 x - 2) + 2*( x + 1) = 28
2 x + 6 x - 4 +2 x + 2 = 28
10 x = 28 + 2
10 x = 30 / : 10
x = 3
=======
c) 6*( x + 1) + 0,5*( 6 + 4)*x = 28
6 x + 6 + 5 x = 28
11 x = 28 - 6
11 x = 22 / : 11
x = 2
====
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Odpowiedź:
a) 0,5*( x + 4 + x)*5=20
( x + 2)* 5 = 20 / : 5
x + 2 = 4
x = 4 - 2 = 2
=============
b) 2 x + 2*( 3 x - 2) + 2*( x + 1) = 28
2 x + 6 x - 4 +2 x + 2 = 28
10 x = 28 + 2
10 x = 30 / : 10
x = 3
=======
c) 6*( x + 1) + 0,5*( 6 + 4)*x = 28
6 x + 6 + 5 x = 28
11 x = 28 - 6
11 x = 22 / : 11
x = 2
====
Szczegółowe wyjaśnienie: