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determina termenul necunoscut din egalitatile urmatoare:<br />
c) (c-17)×3+15=45; d) [2×(d-30)-45]×3=165.<br />
va rog ajutatima


Răspuns :

c) (c-17)×3+15=45
(c-17)×3=45-15
(c-17)×3=30
c-17=30:3
c-17=10
c=17+10
c=27


d) [2×(d-30)-45]×3=165
2×(d-30)-45=165:3
2×(d-30)-45=55
2×(d-30)=55+45
2×(d-30)=100
d-30=100:2
d-30=50
d=50+30
d=80
c) 3c-51+15=45; 3c=45-15+51;3c=81;c=81:3;c=27;
d) (2d-60-45)*3=165; 6d-180-135=165;6d=165+135+180;6d=300+180;6d=480; d=480:6; d=80