Question

Toate trei întrebările

Answer 1

Explicație pas cu pas:

b) A=3⁰+3¹+3²+....+3⁴⁴ => A=(3⁰+3¹+3²)+(3³+3⁴+3⁵)+....+(3⁴²+3⁴³+3⁴⁴) => A=(1+3+9) + 3³(1+3+9)+.....+3⁴²(1+3+9) =>

A=13+3³×13+.....+3⁴²×13 => A=13×(1+3³+3⁶+....+3⁴²)=> A:13

c)A=2²+2⁴+...+2³⁰ => A=(2²+2⁴)+(2⁶+2⁸)+....+(2²⁸+2³⁰) => A=20 + 2⁴(2²+2⁴)+.....+2²⁶(2²+2⁴)=> A=20(2⁴+2⁶+....+2²⁶)=> A:20

d)A=1+5²+5⁴+...+5³⁴=> A=(1+5²)+(5⁴+5⁶)+...+(5³²+5³⁴)=> A=26+5⁴(1+5²)+.....+5³²(1+5²)=> A=26(1+5⁴+5⁸+....+5³²) => A:26