Question

c)|+2|+|+5|+|+8|+...+|+29|=
D)|-2|¹+|-2|²+...+|-20|²⁰=
Repede tot!!!50 de puncte!!!​

Answer 1

Explicație pas cu pas:

10)

$| - 2| = 2; |9| = 9; | - 15| = 15; |0| = 0; \\ | + 26| = 26; | - 42| = 42; | + 14| = 14$

11)

a) A; b) F; c) A; d) A; e) A; f) F; g) A; h) F; i) F

12)

a). = 9 + 9 + 2 = 20

b). = 12 + |- 7| + 3 = 12 + 7 + 3 = 22

c). = 20 : 2 + 3 • 6 = 10 + 18 = 28

d). = 48 : 16 + 84 • 7 = 3 + 588 = 591

13)

a) = 1 + 2 + 3 + ... + 50 = 50•51/2 = 1275

b) = 3 + 6 + 9 + ... + 90 = 3(1 + 2 + 3 + ... + 30) = 3•30•31/2 = 1395