y=log(5+4x-x^)的值域是 1/3
熱心網(wǎng)友
y=log(5+4x-x^)的值域是0＜5+4x-x^=-(x^-4x+4)+9=-(x-2)^+9≤9∴當0＜底數(shù)＜時1，y=log(5+4x-x^)的值域是[log9,+∞)當?shù)讛?shù)＞1時，y=log(5+4x-x^)的值域是(-∞,log9]
y=log(5+4x-x^)的值域是 1/3
y=log(5+4x-x^)的值域是0＜5+4x-x^=-(x^-4x+4)+9=-(x-2)^+9≤9∴當0＜底數(shù)＜時1，y=log(5+4x-x^)的值域是[log9,+∞)當?shù)讛?shù)＞1時，y=log(5+4x-x^)的值域是(-∞,log9]