解不等式组:-x^2+4≥0

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解不等式组:-x^2+4≥0
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解不等式组:-x^2+4≥0
解不等式组:-x^2+4≥0

解不等式组:-x^2+4≥0
-x^2+4≥0
x^2-4

-x^2+4≥0
x^2≤4
-2≤x≤2

移向 -x^2≥-4
去负号 x^2<=4
即:-2<=x <=2

-X^2+4≥0
X^2-4<=0
(X+2)(X-2)<=0
所以:X+2<=0
X-2≥0 (无解)
或: X+2≥0
X-2<=0
解得:-2<=X<=2