Question

Ex 7 plz chiar nu stiu

Answer 1

a=1⇒x=6x1²-5=6-5=1
a=2⇒x=6x2²-5=24-5=19
a=4⇒x=6x4²-5=6x16-5=96-5=91
B={1,19,91}

x=4¹=4
x=4²=16
x=4⁴=256
C={4,16,256}

x²=1⇒x=1
x²=2⇒x=√2
x²=4⇒x=2
x∈N
D={1,2}

A∩B∩D={1,2,4}∩{1,19,91}∩{1,2}={1}
(A∪B)∩D=({1,2,4}∪{1,19,91})∩{1,2}={1,2,4,19,91}∩{1,2}={1,2}
A-D={1,2,4}-{1,2}={4}
(A∪B)-C={1,2,4,19,91}-C={1,2,4,19,91}-{4,16,256}={1,2,19,91}