在數線上滿足6<=｜3x-5｜<17的整數有幾個?
回答 (3)
2016-04-20 1:18 pm
✔ 最佳答案
Sol (1) 3x-5>=0
6<=｜3x－5｜<17
6<=3x－5<17
11<=3x>22
3.66<=x<7.34
4<=x<=7
7－4+1=4…………..
(2) 3x－5<=0
6<=－3x+5<17
－17<3x－5<=－6
－12<3x<=－1
－4<x<=－0.33
－3<=x<=－1
(－1)-(－3)+1=3……….
4+3=7
2016-04-19 11:58 pm
Sol
(1) 3x-5>=0
6<=｜3x－5｜<17
6<=3x－5<17
11<=3x>22
3.66<=x<7.34
4<=x<=7
7－4+1=4…………..
(2) 3x－5<=0
6<=－3x+5<17
－17<3x－5<=－6
－12<3x<=－1
－4<x<=－0.33
－3<=x<=－1
(－1)-(－3)+1=3……….
4+3=7
(1) 3x-5>=0
6<=｜3x－5｜<17
6<=3x－5<17
11<=3x>22
3.66<=x<7.34
4<=x<=7
7－4+1=4…………..
(2) 3x－5<=0
6<=－3x+5<17
－17<3x－5<=－6
－12<3x<=－1
－4<x<=－0.33
－3<=x<=－1
(－1)-(－3)+1=3……….
4+3=7
2016-04-20 4:27 am
6<=｜3x-5｜<17
11<=|3x|<17
11/3<=x<17/3
11/3=3.666666....
17/3=5.666666...
整數有2個,4 and 5
11<=|3x|<17
11/3<=x<17/3
11/3=3.666666....
17/3=5.666666...
整數有2個,4 and 5
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