Question

16. Determină valorile lui a din:
a)[(324+205:5-a) 6].3+127=307
b)[676:13:(31.20-31-a)].45-23.91=247
c){[(205:5+362:2)-32.6+a].221:13}-140:5=635
d)[(30+226:2+a:4):29+20.100]°:5'11.6-5.67=0

20.Determinaţi mr. naturalecare verifică egalităţile:
A)x+5 273=5723
B)x-23 542=42200
C)(x+200):20=45
D)(320+x).15=5100
E) 4x'1000:50-620:4=5
F)(3.x+5.x):8=10
G)15. (36.x'12.x):120=3
H) 7. (15.x+35.x):10+2.x=185

Answer 1

a)
[(324+205:5-a)*6]*3+127=307/-127
[(324+41-a)*6]*3=180/:3
(365-a)*6=60/:6
365-a=10
a=365-10
a=355(sau 5 daca la 6 era impartirea)

b)[676:13;(31*20-31-a)]*45-23*91=247
[52:(789-a)]*45-2093=247/+2093
[52:(789-a)]*45=2340/:45
52:(789-a)=52/*52
789-a=2074
2074-789=a
a=-1285