y＝1-｜x｜1+｜x｜求值域，要过程
y=(1-|x|)(1+|x|)(1-|x|)=y+y|x|(1-y)=(1+y)|x|(1-y)(1+y)=|x|≥0(y-1)(y+1)<=0(y≠ -1)-1<y<=1原函数的值域为(-11]
y＝1-｜x｜1+｜x｜求值域，要过程
y=(1-|x|)(1+|x|)(1-|x|)=y+y|x|(1-y)=(1+y)|x|(1-y)(1+y)=|x|≥0(y-1)(y+1)<=0(y≠ -1)-1<y<=1原函数的值域为(-11]
y＝1-｜x｜1+｜x｜求值域，要过程
y=(1-|x|)(1+|x|)(1-|x|)=y+y|x|(1-y)=(1+y)|x|(1-y)(1+y)=|x|≥0(y-1)(y+1)<=0(y≠ -1)-1<y<=1原函数的值域为(-11]
急求计算一个分阶段计算提成的excel公式。
=LOOKUP(A1,{0,100,200,300;0,002,003,004})(A1-LOOKUP(A1,{0,100,200,300;0,0,200,300}))+(LOOKUP(A1,{0,200,300;0,4,7}))设单数为x
