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2014-06-20T17:26:50+03:00
A·b=54
a·(b+3)=72
a·b+3a=72
54+3a=72
3a=72-54
3a=18
a=6
b=54÷6
b=9
1 5 1
2014-06-20T17:31:25+03:00
A×b=54
a×(b+3)=72
a×b+a×3=72
54+a×3=72
a×3=72-54
a×3=18
a=18:3
a=6

b=54:6
b=9

1 5 1