Question

ex 7 chiar am nevoie va roooog!!!!!

Answer 1

$\it |3-2x|=5 \Rightarrow |2x-3|=5 \Rightarrow 2x-3\in\{-5,\ 5\}|_{+3} \Rightarrow 2x\in\{-2,\ 8\}|_{:2} \Rightarrow x\in$

Answer 2

A={x∈Z/  |x|≤√11}

=> -√11≤x≤√11

x∈Z∩ [-√11;√11]; x∈{-3; -2; -1; 0; 1; 2; 3}

A={-3; -2; -1; 0; 1; 2; 3}

B={x∈Z/ |3-2x|=5}

=> 3-2x=-5; 3-2x=5

2x=8=> x=4

2x=-2=>x=-1

B={-1; 4}

C={x∈Z/ 15≤x²<81

15≤4²; 9²=81, dar x²<81

=> x∈{4; 5; 6; 7; 8}

A={4; 5; 6; 7; 8}