✔ 最佳答案
1攝氏溫度為x度時華氏溫度為y度函數關係為y=32+9x/5當攝氏溫度為幾度時華氏溫度會比攝氏溫度多40度?
Sol
y=x+40
32+9x/5=x+40
160+9x=5x+200
4x=40
x=10
2 若函數f(x)=ax+b,g(x)=-bx+a且f(9)=g(-4),f(-3)=-1則g(-3)=?
Sol
f(9)=9a+b=g(-4)=4b+a
8a=3b=24p
a=3p,b=8p
f(x)=3px+8p
f(-3)=-9p+8p=-1
p=1
g(-3)=24p+3p=27p=27
3 滿足2x-6<=5x+9與6x+2<3x-7的整數解共有多少個?
Sol
2x-6<=5x+9
-15<=3x
-5<=x…………………..
6x+2<3x-7
3x<-9
x<-3
x<=-2…………………
-5<=x<=-2
-2-(-5)+1=4