1)
a-b=20
=>a=b+20
a:b=3 r 2
=>a=b×3+2
Înlocuim :
3b+2-b=20 | - b
2b+2=20 | - 2
2b=18 | :2
=> b = 18 : 2
=> b = 9
Inlocuim:
a-9=20
=> a = 9+20
=> a = 29
=> b=8
=> a=29
Verificam :
29-9=20
29:9=3 r 2
2)
N=6×C+4
N-C=44
N=? C=?
N-C=44
=> N= C+44
N=6×C+4
N |----|----|----|----|----|----|+4
C |----|
=> 6 segmente + 4 - 1 segment = 44
=> 5 segmente + 4 = 44 | - 4
=> 5 segmente = 40 | : 5
=> un segment = 8
=> C=8
=> N=52
Verificam :
52 = 6×8+4
52-8=44
Succes ! ♡♡♡
