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2. Se dau multimile
A={XER| 1-4 <X< 2
B={XER|2x-3|<7}

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Răspuns :

Slavitescudoraask

1-4 < x < 2

-3 < x < 2, x apartine (-3, 2)

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

|2x-3| < 7

-7 < 2x-3 < 7  /+3

-7 +3 < 2x-3+3 < 7+3

-4 < 2x < 10 /:2

-4:2 < 2x:2 < 10:2

-2 < x < 5, x apartine (-2, 5)

B = {-1, 0,1,2,3,4}

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