Ответ:
1.
a) xє(-3;5);
b) xє[-1,2;-1);
c) xє(-∞;5).
2.
2,8x-17>0,3x-4,5,
{
12,3x-16,6≤7,1x+19,8;
2,8x-0,3x>-4,5+17,
12,3x-7,1x≤19,8+16,6;
2,5x>12,5, /:2,5
5,2x≤36,4; /:5,2
x>5,
x≤7. ↓Координатный луч↓
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5. 7
xє(5;7]
Ответ: xє(5;7].
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Answers & Comments
Ответ:
1.
a) xє(-3;5);
b) xє[-1,2;-1);
c) xє(-∞;5).
2.
2,8x-17>0,3x-4,5,
{
12,3x-16,6≤7,1x+19,8;
2,8x-0,3x>-4,5+17,
{
12,3x-7,1x≤19,8+16,6;
2,5x>12,5, /:2,5
{
5,2x≤36,4; /:5,2
x>5,
{
x≤7. ↓Координатный луч↓
////////////////////////
_______°______•_____>
\\\\\\\\\\\\\\\\\\\\\\\\\\\
5. 7
xє(5;7]
Ответ: xє(5;7].