14题
[60,70)对应的频率为0.4(也就是占0.4=40%)
所以有200×0.4=80(辆)
26题
f(x)=2(sin2x*√3/2+1/2*cos2x)=2sin(2x+π/6)
(1)T=2π/ω=2π/2=π
(2)
∵0≤x≤π/2
∴π/6≤2x+π/6≤π+π/6
即π/6≤2x+π/6≤7π/6
∴-1/2≤sin(2x+π/6)≤1
因此最大值为2*1=2;最小值为2*(-1/2)=-1
14题
[60,70)对应的频率为0.4(也就是占0.4=40%)
所以有200×0.4=80(辆)
26题
f(x)=2(sin2x*√3/2+1/2*cos2x)=2sin(2x+π/6)
(1)T=2π/ω=2π/2=π
(2)
∵0≤x≤π/2
∴π/6≤2x+π/6≤π+π/6
即π/6≤2x+π/6≤7π/6
∴-1/2≤sin(2x+π/6)≤1
因此最大值为2*1=2;最小值为2*(-1/2)=-1