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[0,25+2*(x+1,25)]*3+0,25=13 vreau tot calculul scris ofer 50p.
*=ori


Răspuns :

[0,25+2*(x+1,25)]*3=13-0.25
[0,25+2*(x+1,25)]=12.75/3
2x+2,5=4.25-0,25
2x=4-2.5
x=1,5/2
x=0.75
[0,25+2*(0,75+1,25)]*3+0,25=13