請問,若一梯形的上底為x+2,下底為3x-1,且高為10,若此梯形面積不大於33,則x的範圍為何?

2017-08-05 11:45 am

回答 (2)

2017-08-05 12:40 pm
✔ 最佳答案
Sol
A=[(x+2)+(3x-1)]*10/2=(4x+1)*5=20x+5
A<=33
20x+5<=33
20x<=28
x<=7/5
3x-1>0
3x>1
x>1/3
So
1/3<x<=7/5
2017-08-05 5:17 pm
0.5[(x+2)+(3x-1)]*10<33
5(4x+1)<33
20x+5<33
20x<28
x<1.4


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