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Mathematics problems in senior one. I need a detailed process! ! !
1

Yi Zhi, x≠0.

When both sides of the original equation are divided by x, (m- 1)+x+( 1/x)=0.

∴ 1-m=x+( 1/x).

The constructor f (x) = x+( 1/x). (0 < x ≤ 2)。

According to the monotonicity of "tick function", there are

x+( 1/x)≥2。

∴ 1-m≥2.

m≤- 1。

2

According to the topic:

4a? +(b? + 1)=5.

∴√(b? + 1)=√(5-4a? ) and 0 < a < 1.

∴y=a√( 1+b? )

=a√(5-4a? )

=√[a? (5-4a? )]

=√{(25/ 16)-4[a? -(5/8)]? }≦5/4.

The equal sign can only be obtained when a=(√ 10)/4.

∴ymax=5/4.

3∶x > 1。

∴ x- 1 > 0, according to the basic inequality:

(x- 1)+[ 1/(x- 1)]≥2。 The equal sign can only be obtained when x=2.

∴x+[ 1/(x- 1)]≧3.

∴min=3.

four

5 You can set the general term an = a 1× q (n- 1).

a3=a 1×q? ,a5=a 1×q^4,a6=a 1×q^5.

∴ From 2a5=a3+a6, we can get:

2q? = 1+q? .

q? -2q? + 1=0.

(q? -q? )-(q? - 1)=0

(q- 1)(q? -q- 1)=0。

∴q? =q+ 1。 Solution: q=( 1+√5)/2.

Original formula =(q? +q^4)/(q^3+q^5)

=( 1+q? )/(q+q? )

= 1/q。

=2/( 1+√5)

=(√5- 1)/2.