Question

X=1203 +2+4+6+...+2404

Answer 1

Răspuns

1447209

Explicație pas cu pas:

x = 1203+2(1+2+3+...+1202) = 1203+2x1202x1203/2 = 1203+1202x1203 =

1203(1+1202) = 1203x1203 = 1203² = 1447209 ;

Answer 2

Răspuns

X = 1203 + 2 + 4 +..+ 2404

X = 1203 + 2·(1 + 2 + .. + 1202)

X = 1203 + 2·1202·1203 : 2

X = 1203·(1 + 1202)

X = 1203·1203

X = 1203²