Question

REPEDE VA ROG FRUMOS ​

Answer 1

Explicație pas cu pas:

-4<=5x+7/2<16 /×2

-4×2<=5x+7<16×2

-8<=5x+7<32 /-7

-8-7<=5x<32-7

-15<=5x<25 /:5

-15:5<=x<25:5

-3<=x<5

A={-3;-2;-1;0;1;2;3;4}

-1<=7x+12/9<=6 /×9

-1×9<=7x+12<=6×9

-9<=7x+12<=54 l-12

-9-12<=7x<=54-12

-21<=7x<=42 /:7

-21:7<=x<=42:7

-2<=x<=6

B={-2;-1;0;1;2;3;4;5;6}

AnBnN={0;1;2;3;4}

AuBnZ={-3;-2;-1;0;1;2;3;4;5;6}