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a fost răspuns

Daca a+b=20 si b+c=30 , calculati 3a+7b+4c.
daca a+b=33 si a+c=11 , calculati 5a+3b+2c.

Răspuns :

Alimicutza
3a+7b+4c putem scrie ca :

a+b+a+b+a+b+ b+c+b+c+b+c+b+c=20*3+30*4=60+120=180

5a+3b+2c putem scrie ca :

a+b+a+b+a+b+a+c+a+c=33*3+11*2=99+22=121

Sper ca te-am ajutat!!!!!

Fjuihdskfweqgi
a+b=20,b+c=30
3a+7b+4c=(a+b)x3+(b+c)x4=20x3+30x4=60+120=180
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a+b=33,a+c=11
5a+3b+2c=3(a+b)+2(a+c)=3x33+2x11=99+22=121

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