Question

1. Aflati numărul necunoscut a din:
a) 4a + 24 = 68;
d) (7 + a) 10 = 90;
g) {[(2a + 3)2 +3] . 2 + 3} 2+ 3 = 85;
b) 3a + 51 = 90; e)(8 + a): 21 = 100;
h) (3 +7.a): 8 + 50 = 60;
c) 7a-35 = 56;
1) (29-a) 20 = 400; i) 240: [(9.a -120). 3 - 1001 = 3;
j) 10 + 100 : [10+ 10 (10 - 10:a)] -20 = 0.​

Answer 1

a. 4a=44
a=11
d. 70+10a=90
10a=20
a=2
g.((4a+9)•2+3)2+3=85
(8a+21)2+3=85
16a+45=85
16a=40
a=4/10
b. 3a=39
a=13
c. 7a=21
a=3