Question

Va rog sa ma ajutati.........Va rog...............E pentru camytza2003.daca vreaw

Answer 1

26
a-1+2+3+...+9=9*10:2=45
b-1+2+3+...50=50*51"2=1275
c-1+2+3+...+100=100*101:2=5050
d-1+2+3+...1000=1000*1001:2=500500
27
a-1+3+5+...+99=50*50=2500
b=1+3+5+...199=100*100=10000
c-2+4+6+...+100=2(1+2+3+...+50)=2*50*51:2=50*51=2550
e-1+5+9...+101=1+1+1...+1+4(1+2+...+20)=1*21+4*21*20:2=861
f-3+7+11+...+99=3*25+4*24*25:2=1275


28.a+b=35=>a=35-b
(a+2)*3=b+31
3a+6=b+31
3a-b=31-6
3a-b=25
3(35-b)-b=25
105-3b-b=25
4b=80
b=20
a=15

29.m+g+b=6871
m=g-3=>g=m+3
m=2b+9=>b=m-9/2
inlocuim si obtinem
m+m+3+m-9/2=6871
5m=13740
m=2748
g=2751
b=1372