Вопрос школьника по предмету Математика
1)|4х+1|≤7 2)|2х+3|≤4 3)|х+1|≤2,5 4)|2х-5|≤3 5)|2+3х|≤7 6)|2-5х|≤8
Ответ учителя по предмету Математика
1). |4х+1| ≤
7
-7 ≤
4x+1 ≤
7
-8 ≤
4x ≤
6
-2 ≤
x ≤
1.5
Ответ: -2, -1, 0, 1.
2). |2х+3| ≤ 4
-4 ≤ 2x+3 ≤ 4
-7 ≤ 2x ≤ 1
-3.5 ≤ x ≤ 0.5
Ответ: -3, -2, -1, 0.
3). |х+1| ≤
2.5
-2,5 ≤
x+1 ≤
2.5
-3.5 ≤
x ≤
1.5
Ответ: -3, -2, -1, 0, 1.
4). |2х-5| ≤ 3
-3 ≤ 2x-5 ≤ 3
2 ≤ 2x ≤ 8
1 ≤ x ≤ 4
Ответ: 1, 2, 3, 4.
5). |2+3х| ≤
7
-7 ≤
2+3x ≤
7
-9 ≤
3x ≤
5
-3 ≤
x ≤
5/3
Ответ: -3, -2, -1, 0, 1.
6). |2-5х| ≤ 8
-8 ≤ 2-5x ≤ 8
-10 ≤ -5x ≤ 6
-1.2 ≤ x ≤ 2
Ответ: -1, 0, 1, 2.
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