Răspuns :
a)___
ab5=100a+10b+5
___
ab6=100a+10b+6
100a+10b+5+100a+10b+6=311
200a+20b+11=311
200a+20b=300
10a+b=15
b=5
a=1
__
ab =15
a*b=1*5=5
verificare 155+156=311
b)
3x-11=x+25
2x=36
x=18
c) (3x-8):5=32
3x-8=160
3x=168
x=168/3
x=56
d)x+23+x+25=122
2x=122-48
2x=74
x=37
ab5=100a+10b+5
___
ab6=100a+10b+6
100a+10b+5+100a+10b+6=311
200a+20b+11=311
200a+20b=300
10a+b=15
b=5
a=1
__
ab =15
a*b=1*5=5
verificare 155+156=311
b)
3x-11=x+25
2x=36
x=18
c) (3x-8):5=32
3x-8=160
3x=168
x=168/3
x=56
d)x+23+x+25=122
2x=122-48
2x=74
x=37
a) ab5+ab6=311
5+6=11
ab0+ab0=300
ab+ab=30
ab=15
b)3x-11=x+25 |-x+11
2x=36
x=18
c) (3xa-8):5=32
3xa-8=32x5
3a=160+8
a=168:3
a=56
d) x+23+x+25=122 |-28
2x=74 |:2
x=37
5+6=11
ab0+ab0=300
ab+ab=30
ab=15
b)3x-11=x+25 |-x+11
2x=36
x=18
c) (3xa-8):5=32
3xa-8=32x5
3a=160+8
a=168:3
a=56
d) x+23+x+25=122 |-28
2x=74 |:2
x=37