Xét biểu thức sau: (2*x < 9) and (x <=4). Biểu thức cho kết quả True khi x=?

2 câu trả lời

(Điều kiện A) and (Điều kiện B) true khi A= true và B = true 

⇒ (2 * x < 9) và (x ≤ 4) đều đúng

Nếu:

x = 4 ≤ 4⇒ 2 * 4 = 8 <9 (A và B đều đúng)  ⇒ true

x = 3 ≤ 4⇒ 2 * 3 = 6 <9 (A và B đều đúng)  ⇒ true

...

Vậy Biểu thức cho kết quả True khi x ≤ 4

điều kiện là:

(2 nhân x nhỏ hơn 9) và (x nhỏ hươn hoặc bằng 4)

ta sẽ có các số: 1,2,3,4

vì:

1<=4 đúng;

1*2<9 đúng;

$$$$

2<=4 đúng;

2*2<9 đúng;

$$$$

3<=4 đúng;

3*2<9 đúng;

$$$$

4<=4 đúng;

4*2<9 đúng;

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