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1. a) 15·(36·x-12·x):120=3
b)(3·x+5·x):8=10
c) 7·(15·x+35·x):10+2·x=185
2. (x·y+79·5):(304-296)·5-177=73
3. a) 1+2+3+....+100+x=5050
b)1·2·3·4·...·n·x=1·2·3·4·...·n·(n+1),n∈Ν*
(macar doar unu daca stitii va roggggggggg!!!

Răspuns :

(3x +5x ):8 = 10  [tex]\Rightarrow[/tex] 8x:8=10

x=10

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