Răspuns :
a+b=1087
a-b=399
suma nr. egale=1087-399=688
nr.b=688:2=344
nr.a=344+399=743
a-b=399
suma nr. egale=1087-399=688
nr.b=688:2=344
nr.a=344+399=743
1) a_____
b_____+399. }1087
1087-399=688
688÷2=344(a)
344+399=743(b)
2) a_____
b_____+975. }1835
1835-975=860
860÷2=430(a)
430+975=1405(b)
b_____+399. }1087
1087-399=688
688÷2=344(a)
344+399=743(b)
2) a_____
b_____+975. }1835
1835-975=860
860÷2=430(a)
430+975=1405(b)