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a fost răspuns

2a+2b=
5a+7b+2c=
a+b=17,25
b+c=2,4


Răspuns :

b+c=2,4
a+b=17,25
2a+2b=?
2*(a+b)=?
2*17,25=34,5
5a+7b+2c=?
a+b+a+b+a+b+a+b+a+b+b+c+b+c=17,25+17,25+17,25+17,25+17,25+2,4+2,4=
5a+7b+2c=91,05