Explicație pas cu pas:
a+b+c+d+e=147
b=a+2 ;
c=b+2
d= c +2
e =a ÷ 2
notam : a ÷2=y => a= 2y
=> e=2y÷y
e=y
b=2y+2
c= 2y+2+2 => c= 2y+4
d = 2y+4+2 => d= 2y+6
rescriem:
2y+2y+2+2y+4+2y+6+y=147
9y+12=147
9y=147-12
9y=135
y=135÷9
y=15
a=15×2
a=30
b=30+2 => b=32
c=32+2 => c=34
d=34+2 => d=36
e=y => e=15
verificare :
30+32+34+36+15=
=62+70+15=
=132+15=
=147