Question

18 x 1+4+7+10+13+16+19+...+97+100

Answer 1

18 . (1 + 4 + 7 + 10 + ... + 100)

= 18 . [(1 + 100) . 34 : 2]

= 18 . 1717 = 30906

Answer 2

18 x 1+4+7+10+16+16+19+....+97+100

= 18 x (100 - 1 ) : 3 + 1 = 18 x 298

= 18 x (100 + 1) x 298 : 2 = 15049

= 18 x 15049

= 270882

Answer 3

\(18.1+4+7+10+13+16+19+...+97+100\)

\(=18+\left(4+7+10+13+...+97+100\right)\)

SSH: \(\left(100-4\right):3+1=33\)

Tổng: \(\left(100+4\right).33:2=1716\)

\(\Rightarrow=18+1716=1734 \)

Vậy......

Answer 4

18.1+4+7+10+13+16+19+...+.97+100

=18+(100+1)((100-1);3+1):2

=18+1717

=1735