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rezolvati in N ecuatiile 12+x+15=75
215+x=2x+115
2x-x-210=310
2(x+1)=18
3(x-1)=21
VA ROG!

Răspuns :

Renatemambouko
12+x+15=75
x=75-27
x=48

215+x=2x+115
2x-x=215-115
x=100

2x-x-210=310
x=310+210
x=520

2(x+1)=18
x+1=9
x=8

3(x-1)=21x-1=7
x=8

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