Question

Rezolvati ecuatiile :
a) (x+5) + (x-4) = 11
b) (x+3) + (x-1) + (x+23) = 52
c) [(x+29*2 ) * 3 + 4 ] * 11 = 1991

Answer 1

x+5+x-4=11 3x+25=52
2x+1=11. 3x=52-25
2x=11-1. x=27:3
x=10:2. x=9
x=5

[(x+58)*3+4]*11=1991
(3x+123+4)*11=1991
(3x+127)*11=1991
3x+127=1991:11
3x+127=181
3x=181-127
x=55:3
x=18

Answer 2

(Desfacem parantezele): a). x+5+x-4=11; 2x=11-1; x=10:2; x=5. b). x+3+x-1+x+23=52; 3x+25=52; 3x=27; x=9; c) [3(x+58)+4]11=1991; 11(3x+174+4)=1991; 33x+1958=1991; 33x=1991-1958; 33x=33; x=1.