Question

A ={x € Z|9 supra 2x-3
B={x € Z|7 supra 2x+1​

Answer 1

Răspuns:

Explicație pas cu pas:

2x-3 divide 9 pt ca expresia sa fie numar intreg

2x-3∈D9

D9={-1,-3,-9, 1,3,9}

2x-3=-1, x=1∈Z

2x-3=-3, x=0∈Z

2x-3=-9, x=-3∈Z

2x-3=1, x=2∈Z

2x-3=3, x=3∈Z

2x-3=9, x=6∈Z

A={-3,0,1,2,3,6}

b. 2x+1∈D7

D7={-7, -1,1,7}

2x+1=-7, x=-4∈Z

2x+1=-1, x=-1∈Z

2x+1=1, x=0∈Z

2x+1=7, x=3∈Z

B={-4,-1,0,3}