How to find the maximum value of X / (1 + x)

How to find the maximum value of X / (1 + x)

Obviously x > = 0
X = 0, the original formula = 0
x>0
Then √ x > 0
Divide up and down by 1 / (√ x + 1 / √ x)
If √ x > 0, then √ x + 1 / √ x > = 2
So 0

In triangle ABC, a = 2, B = 2 times root 2, C = 15 degrees, solve triangle

First of all, use cosine theorem to find C: C ^ 2 = a ^ 2 + B ^ 2 - 2Ab * COSC = 8 - 4 times root sign 3, then use sine theorem to find a, BA / Sina = B / SINB = C / sinc, so Sina = sinc * A / C = 1 / 2, a = 30 degree, SINB = sinc * B / C = 2 / 2 root sign, 2b is obtuse angle, so = 135 degree

1. In the triangle ABC, it is known that sinA:sinB= Root 2:1, C ^ 2 = B ^ 2 + root 2BC, find the degree of three angles

According to the sine theorem: A / Sina = B / SINB, Sina / SINB = A / B can be obtained from the meaning of the title: A / b = √ 2 / 1, a = √ 2B, according to the cosine theorem, cosa = (B & # 178; + C & # 178; - A & # 178;) / 2BC = [B & # 178; + (B & # 178; + √ 2BC) - 2b & # 178;] / 2BC = √ 2BC / 2BC = {2 / 2} a = 45 °

How to calculate 19 × 27 + 19 × 23 + 190 × 5 simply

Original formula = 19 * (27 + 23) + 190 * 5
=19*50+190*5
=19*50+19*50
=19*50*2
=19*100
=1900

27/13*()=8/3*()=6/5*（）=1
It's from the bottom

27/13*(13/27)=8/3*(3/8)=6/5*（5/6）=1

-5.27+3.8-（-1.2）+（-0.5）

-5.27+3.8-（-1.2）+（-0.5）
=-5.27+3.8+1.2-0.5
=-5.77+5
=-0.77

_ (68)=?_ (+ 0.75) =? Simplify the following numbers

-68
-0.75

Simplification: A-1 / A-1

Hello
a²/(a-1)-a-1
=【a²-（a+1）（a-1）】/(a-1)
=(a²-a²+1)/（a-1）
=1/(a-1)
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How to simplify positive and negative numbers, such as + l-14l

|The absolute value sign in - 14 | changes - 4 to + 4, so + | - 14 | = 14

Simplify the solution of positive and negative numbers * to find the formula [- (- 5), - (+ 2), + (- 3)]

5 -2 -3