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1.REZOLVATI , in multimea rumerelor naturale , ecuatiile in doua moduri:
a)5(x-1)+11=26 b)3(x+5)+6=33 c)8(x-1)+15=55 d)10(x+2)+17=67 e)9(x-3)-23=22
f)2(2x-3)-9=1 g)2+3(x+1)=10


Răspuns :

a) 5x-5+11=26 5x=26-11+5=20 5X=20 x=20:5 x=4 mod 2 ×-1=26-11:5 x-1=3 ×=3+1=4