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igormauroalmei
@igormauroalmei
July 2022
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(PUC-SP) A soma dos números inteiros x que satisfazem 2x + 1 ≤ x +3 ≤ 4x é:
a) 0 b) 1 c) 2 d) 3 e) - 2
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2x + 1 ≤ x +3 ≤ 4x
2x + 1 ≤ x + 3 ==> 2x - x≤ - 1 + 3 ==> x ≤ 2
x + 3 ≤ 4x ==> x - 4x ≤ - 3 ==> - 3x ≤ - 3 ==>x ≤ 1
1 ≤ x ≤ 2
1 + 2 ==> 3
Letra A
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Verified answer
2x + 1 ≤ x +3 ≤ 4x
2x + 1 ≤ x + 3 ==> 2x - x≤ - 1 + 3 ==> x ≤ 2
x + 3 ≤ 4x ==> x - 4x ≤ - 3 ==> - 3x ≤ - 3 ==>x ≤ 1
1 ≤ x ≤ 2
1 + 2 ==> 3
Letra A