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Rezolvati ecuatiile si inecuatiile:a 18:x=9 b 3x+2=32 c 2x-1=17 d 5(x+7)=54

Răspuns :

18:x=9
18=9*x
9x=18
x=18:9
x=2

3x+2=32
3x=32-2
3x=30
x=30:3
x=10

2x-1=17
2x=17+1
2x=18
x=18:2
x=9

5(x+7)=54
5x+35=54
5x=54-35
5x=19
x=19:5
x=3,8
sau
5(x+7)=54
x+7=54:5
x+7=10,8
x=10,8-7
x=3,8