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Belissima1
a fost răspuns

stiind ca a+b=25si c=16 calculati a•b+b•c si 2•a+2•b+3•a•c+3•b•c

Răspuns :

Capsunica35
2a+2b+2ac+2bc=2(a+b)+2c(a+b)=2*25+2*16*25=50+800=850
ac+bc=c(a+b)=16*25=400
2a+2b+2ac+2bc=
2x(a+b)+2cx(a+b)=
2x25+2x16x25=
50+800=850
ac+bc=c(a+b)=
16x25=400

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