高一数学!!!!!
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令:a=2^x
则:y=a²-3a+3
所以:1<=a²-3a+3<=7
1<=a²-3a+3
a²-3a+2>=0
(a-1)(a-2)>=0
a<=1或a>=2
a²-3a+3<=7
a²-3a-4<=0
(a-4)(a+1)<=0
-1<=a<=4
所以:-1<=a<=1或2<=a<=4
a=2^x>0
所以:0<2^x<=1或2<=2^x<=4
即:0<2^x<=2^0或2^1<=2^x<=2^2
所以:x<=0或1<=x<=2
希望我的回答对你有帮助,采纳吧O(∩_∩)O!
则:y=a²-3a+3
所以:1<=a²-3a+3<=7
1<=a²-3a+3
a²-3a+2>=0
(a-1)(a-2)>=0
a<=1或a>=2
a²-3a+3<=7
a²-3a-4<=0
(a-4)(a+1)<=0
-1<=a<=4
所以:-1<=a<=1或2<=a<=4
a=2^x>0
所以:0<2^x<=1或2<=2^x<=4
即:0<2^x<=2^0或2^1<=2^x<=2^2
所以:x<=0或1<=x<=2
希望我的回答对你有帮助,采纳吧O(∩_∩)O!
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