Ответ:
Объяснение:
1.
2x²-7x-4≤0
2x²-8x+x-4≤0
2x*(x-4)+(x-4)≤0
(x-4)*(2x+1)≤0
-∞__+__-0,5__-__-4__+__+∞
x∈[-0,5;4].
2.
{8x-2<x-1 {7x<1 |÷7 {x<1/7 x∈(-∞;1/7).
{2x²-x-1≤0 {2x²-2x+x-1≤0 {2x*(x-1)+(x-1)≤0 {(x-1)*(2x+1)≤0
-∞__+__-0,5__-__1__+__-+∞
x∈[-0,5;1]
Согласно ОДЗ:
x∈[-0,5;1/7).
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Verified answer
Ответ:
Объяснение:
1.
2x²-7x-4≤0
2x²-8x+x-4≤0
2x*(x-4)+(x-4)≤0
(x-4)*(2x+1)≤0
-∞__+__-0,5__-__-4__+__+∞
x∈[-0,5;4].
2.
{8x-2<x-1 {7x<1 |÷7 {x<1/7 x∈(-∞;1/7).
{2x²-x-1≤0 {2x²-2x+x-1≤0 {2x*(x-1)+(x-1)≤0 {(x-1)*(2x+1)≤0
-∞__+__-0,5__-__1__+__-+∞
x∈[-0,5;1]
Согласно ОДЗ:
x∈[-0,5;1/7).