Question

Ma ajutati va rog ex 3.Dau coroană

Answer 1

$3)a)100(0.01 + 0.02 + 0.03 + ... + 0.09)$

$= 100 \times 0.01 + 100 \times 0.02 + 100 \times 0.03 + ... + 100 \times 0.09$

$= 1 + 2 + 3 + ... + 9$

$= \frac{9(9 + 1)}{2}$

$= \frac{9 \times 10}{2}$

$= \frac{90}{2}$

$= 45$

$b)5.8 \times 1.4 + 5.8 \times 3.6 + 5.8 \times 3.2 + 5.8 \times 1.8$

$= 5.8(1.4 + 3.6 + 3.2 + 1.8)$

$= 5.8 \times 10$

$= 58$