Odpowiedź:
a=25+r
b=25+r+r=25+2r
c=25+2r+r=25+3r
40=25+3r+r=25+4r
4r=15/:4
r=15/4
[tex]\displaystyle a=25+\frac{15}{4} =\frac{115}{4} \\b=\frac{115}{4} +\frac{15}{4} =\frac{130}{4} \\c=\frac{130}{4} +\frac{15}{4} =\frac{145}{4}[/tex]
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Odpowiedź:
a=25+r
b=25+r+r=25+2r
c=25+2r+r=25+3r
40=25+3r+r=25+4r
4r=15/:4
r=15/4
[tex]\displaystyle a=25+\frac{15}{4} =\frac{115}{4} \\b=\frac{115}{4} +\frac{15}{4} =\frac{130}{4} \\c=\frac{130}{4} +\frac{15}{4} =\frac{145}{4}[/tex]