A sufficient condition for differentiability in binary functions, right

Differentiable is differentiable, differentiable and continuous is differentiable

The relationship between differentiability and continuity of binary function

The differentiable function of two variables is not necessarily continuous, and the continuous function is not necessarily differentiable

Given that a (6,0), B (0,5) and the moving point P (x, y) move on the line AB, then the maximum value of XY is
A.12/5 B.144/49 C.15/2 D.5

C
If the abscissa of point P is x, then (6-x) / y = 6 / 5
Y = (30-5x) / 6
XY=X(30-5x)/6
=-5/6X^2+5X
Fmax=-25/4*(-5/6)
=15/2

In △ ABC, ab = AC, ∠ BAC = 120 °, ab = AC, point D is the midpoint of BC, de ⊥ AB is at point E, and the value of AE: EB is obtained

3:1

13.6 square meters = [] square meters [] square decimeters 20.2 square decimeters = [] square decimeters [] square centimeters
6.25 square meters = [square meters]. [square decimeters] 81 square centimeters of 20 parts of square centimeters = [ordinary centimeters]. [ordinary millimeter 3 square meters 15 square decimeters = [square meters] = [square decimeters] 10 square meters 5 square decimeters = [square meters] = [square decimeters] 2 square decimeters 20 square centimeters = [square decimeters] = [square centimeters] 2 square meters, 4 square decimeters, 30 square centimeters, 5.02 square meters, 2030 square centimeters, 5.06 square meters, 5.06 square meters

6.25 square meters = [6] square meters [25] square decimeters
81 / 20 square centimeter = [4] square centimeter [5] square millimeter
3 square meters 15 square decimeters = [3.15] square meters = [315] square decimeters
10 square meters 5 square decimeters = [10.05] square meters = [1005] square decimeters
2 square decimeter 20 square centimeter = [2.2] square decimeter = [220] square centimeter
2 square meters 4 square decimeters 30 square centimeters = [2.043] square meters
5.02 square meters = [5] square meters [2] square decimeters
2030 square centimeter = [20] square decimeter [30] square centimeter
06 square meters = [5] square meters [6] square decimeters

A rectangular playground, perimeter is 1200 meters, length is 400 meters, width is how many meters? Area is how many square meters?

1200/2=600 600-400=200 200*400=80000

If the lengths of the three median lines of a triangle are known to be 3, 4 and 6, then the circumference of the triangle is ()
A. 6.5B. 13C. 24D. 26

The lengths of the three median lines of the triangle are 3, 4 and 6. The three sides of the triangle are 6, 8 and 12. The circumference of the triangle is 6 + 8 + 12 = 26

Given the square of a + 2a-1 = 0, find the square of a + 1 / 2 of A

A ^ 2 + 2a-1 = 0 a ^ 2-1 = - 2A two sides divide by a to get A-1 / a = - 2 two sides at the same time square to get a square + 1 / a-2-2 = 4 to get a ^ 2 + 1 / A ^ 2 = 6 this method is OK. Avoid the process of solving, save the country by curve
Thank you!

Look at the picture and guess the idioms: 1. The black character "Mianmian" is marked three times in the middle. 2. The character "Neng Neng" is on the left, and the upper part of the character "Neng Neng" is tilted to the left

Double faced
can take temporary setbacks

Lesson plan of how plants drink water

However, I found that when they watered, they mainly sprinkled water on the soil. What's the matter? 2. We all think that plants depend on their roots to drink water. So, what kind of roots do you see? 3. Student report. 2. Observe the roots of plants. 1. How to drink water for plants

A sufficient condition for differentiability in binary functions, right