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Mandrunicole
a fost răspuns

Se stie ca a+b+c =7.calculati:
a) 2×a+2×b+2×c;
b)10×a+10×b+10c;
c)a×13+b×13+c×13+21.

Răspuns :

Mihaelap
a) 2 *(a + b + c) = 2 * 7 = 14
b) 10 * (a + b + c) = 10 * 7 = 70
c) 13 * (a + b+ c) + 21 = 13 * 7 + 21 = 91 + 21 = 112
a) 2(a+b+c)=2x7=14
b)10(a+b+c)=7x10=70
c)13(a+b+c)+21=13x7+21=91+21=112

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