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(﹣∞,ln2﹣1) (﹣∞,ln2﹣1] (1﹣ln2,+∞) [1﹣ln2,+∞)
T1/2=ln2/λ T1/2=λ/1n2 T1/2=λ/1n10 T1/2=ln10/λ T1/2=λln2
logba<1 logab<0 logba<0 0<logab<1
T=ln2/λ T=λ/1n2 T=λ/1n10 T=ln10/λ T=λln2
2f(ln2)>3f(ln3) 2f(ln2)<3f(ln3) 2f(ln2)≥3f(ln3) 2f(ln2)≤3f(ln3)
(-2,ln5) (-1,ln2) (1,ln2) (2,ln5)
cosy+2yex+2xln2,xsiny-ex cosy-2yex-2xln2,xsiny+2ex cosy-2yex+2xln2,xsiny-2ex siny-2yex+2xln2,xcosy-2ex
(-2,ln5) (-1,ln2) (1,ln2) (2,ln5)
(-2,ln5) (-1,ln2) (1,ln2) (2,ln5)
T1/2=ln2/λ T1/2=λ/ln2 T1/2=λ/ln10 T1/2=ln10/λ T1/2=λln2
T1/2=ln2/λ T1/2=λ/1n2 T1/2=λ/1n10 T1/2=ln10/λ T1/2=λln2
(﹣2,ln2) (2,﹣ln2) (﹣ln2,2) (ln2,﹣2)
0<a<ln2或1<a<2 ln2<a<1或1<a<2
0<a<ln2或1<a<2或a>2 ln2<a<1或1<a<2或a>2
(-2,ln5) (-1,ln2) (1,ln2) (2,ln5)
2(ln2﹣1) ln2﹣1