Question

数学题 急求～

大家辛苦 这道题 求解答，给点过程。中英皆可 谢谢大家

Answer 1

Log2^5理解为以2为底5的对数, 利用对数换底公式，其值是 (lg5)÷(lg2) =[1 – lg2]÷(lg2) =1÷(lg2) – 1 ≈1÷(0.3010) – 1 ≈2.322 2Log2^3 =2[(lg3)÷(lg2)] ≈2×(0.4771)÷(0.3010) ≈3.170

Answer 2

a) f(x) has at least 4 roots in [-2, 2] because f(x) changes its sign four times in the interval.
b) Draw the five given points and link it one by one.
c) Draw isolated points, and you can find no x-intercept.

追问

您好 ，十分感谢，能不能给一下c的详细过程和图。还是有点不明白。谢谢谢谢

就是这个的最后一问