如图 函数y=2sin(wx+φ) (0该题是选择题 A,W=10/11 φ=π/6 B,W=11/10 φ=π/3 C,W=2 φ=π/6 D,W=2 φ=π/3
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![如图 函数y=2sin(wx+φ) (0该题是选择题 A,W=10/11 φ=π/6 B,W=11/10 φ=π/3 C,W=2 φ=π/6 D,W=2 φ=π/3](/uploads/image/z/7625957-5-7.jpg?t=%E5%A6%82%E5%9B%BE+%E5%87%BD%E6%95%B0y%3D2sin%28wx%2B%CF%86%29+%280%E8%AF%A5%E9%A2%98%E6%98%AF%E9%80%89%E6%8B%A9%E9%A2%98++++++++++++++++++++++++A%2CW%3D10%2F11+%CF%86%3D%CF%80%2F6++++++++++++++++++++++++++++++++++++++++++++++++B%2CW%3D11%2F10+++++%CF%86%3D%CF%80%2F3+++++++++++++++++++++++C%2CW%3D2++%CF%86%3D%CF%80%2F6+++++++++++++++++++++++D%2CW%3D2++%CF%86%3D%CF%80%2F3)
如图 函数y=2sin(wx+φ) (0该题是选择题 A,W=10/11 φ=π/6 B,W=11/10 φ=π/3 C,W=2 φ=π/6 D,W=2 φ=π/3
如图 函数y=2sin(wx+φ) (0
该题是选择题
A,W=10/11 φ=π/6
B,W=11/10 φ=π/3
C,W=2 φ=π/6
D,W=2 φ=π/3
如图 函数y=2sin(wx+φ) (0该题是选择题 A,W=10/11 φ=π/6 B,W=11/10 φ=π/3 C,W=2 φ=π/6 D,W=2 φ=π/3
x=0时,y=2sinφ=1,sinφ=0.5,
φ=兀/6,
y=0时,2sin(w*11兀/12+兀/6)=0,
w=2
此处,因为有图,y值从负到正,故用k兀的话也只能用2k兀,k为整数
选C
把(0,1)和(11/12π,0)代入y=2sin(wx+φ)得
2sinφ=1........(1)
φ=π/6
11π/12+π/6=13π/12
w=2π/T=2π/13π/12=24/13
2sinφ=1
sinφ=0.5
φ=π/6
2sin(w11π/12+π/6)=0
11wπ/12+π/6=2kπ
w=12/11[2k-1/6]
k为整数
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