Question

afla produsul numerelor a,b,c, si d, daca sunt indeplinite simultan conditiile: a+a=b; b+b=c; c+c=d; d+64=80

Answer 1

a+a=b

b+b=c

c+c=d

d+64=80

d=80-64

d=16

c+c=d

2c=d

2c=16

c=16:2

c=8

b+b=c

2b=8

b=8:2

b=4

a+a=b

2a=4

a=4:2

a=2

a×b×c×d=

=2×4×8×16=8×8×16=64×16=1024

Answer 2

2a=b

2b=c=>c=4b

2c=d=>d=8b

d+64=80=> 8b+64=80, 8b=80-64= 16=>b=2

=> b=4, c=8 , d=16 => a•b•c•d=2•4•8•16= 16•16= 256