%%%%%%%%%『高一数学』『函数』『基础题』%%%%%%%%%y=2sin(πx/2+π/5)对任意x属于R都有 f(x1)

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%%%%%%%%%『高一数学』『函数』『基础题』%%%%%%%%%y=2sin(πx/2+π/5)对任意x属于R都有f(x1)%%%%%%%%%『高一数学』『函数』『基础题』%%%%%%%%%y=2s

%%%%%%%%%『高一数学』『函数』『基础题』%%%%%%%%%y=2sin(πx/2+π/5)对任意x属于R都有 f(x1)
%%%%%%%%%『高一数学』『函数』『基础题』%%%%%%%%%
y=2sin(πx/2+π/5)对任意x属于R都有 f(x1)

%%%%%%%%%『高一数学』『函数』『基础题』%%%%%%%%%y=2sin(πx/2+π/5)对任意x属于R都有 f(x1)
要满足不等式恒成立 显然f(x1)为原函数的最小值 f(x2)为原函数的最大值
则有x1×π/2+π/5=3π/2+K1π/2
x2×π/2+π/5=π/2+K2π/2 (K1 K2分别为任意整数)
解得x1=K1+13/5 x2=K2+3/5
|x1-x2|=|K1—K2+1|
则且仅当K1=K2时 原式有最小值为1