Răspuns :
a+b=49
a:b=6
a=bX6
bX6+b=49
6b+b=49
7b=49
b=49:7
b=7
a+7=49
a=49-7
a=42
Succes
a+b=49 1+1=2(seg.egale)
a:b=6 49-7=42
a_______+7 42:2=21(b)
b________ 21+7=28(a)
Verificare: 28+21=49
a+b=49
a:b=6
a=bX6
bX6+b=49
6b+b=49
7b=49
b=49:7
b=7
a+7=49
a=49-7
a=42
Succes
a+b=49 1+1=2(seg.egale)
a:b=6 49-7=42
a_______+7 42:2=21(b)
b________ 21+7=28(a)
Verificare: 28+21=49