Question

8. Stabiliti valoarea de adevăr a propozitiilor:
a) 11(213 +2102-2101);
b) 71(1+2+3+4+...+27).va rog urgent!!!!​

Answer 1

$11 \times (213 + 2102 - 2101) = \\ 11 \times (2315 - 2101) = \\ 11 \times 214 = 2354 \\ \\ 71(1 + 2 + 3 + ... + 27) = \\ 71 \times (27 \times (27 + 1) \div 2 = \\ 71 \times (27 \times 28) \div 2 = \\ 71 \times 27 \times 14 = \\ 1917 \times 14 = \\ 29838$

sper ca te.am ajutat :). Vreau coroana