For any real number x1, X2, min {x1, X2}, denote the smaller of x1, X2, if f (x) = 2-x2, Why is the answer 1

For any real number x1, X2, min {x1, X2}, denote the smaller of x1, X2, if f (x) = 2-x2, Why is the answer 1

Let f (x) = 2-x & # 178; and G (x) = x, then the image of Min {f (x), G (x)} is the lower part of the above two curves
Are you satisfied with the above answers?

Matlab: to solve the differential equation cosxsinydy = cosysinxdx, when x = 0, y = 4 / PI

∵cosxsinydy=cosysinxdx
==>sinydy/cosy=sinxdx/cosx
==>d(cosy)/cosy=d(cosx)/cosx
==>Lncosy = lncosx + LNC (C is an integral constant)
==>cosy=C*cosx
The general solution of the original equation is cosy = C * cosx (C is an integral constant)
When x = 0, y = π / 4
∴cos(π/4)=C*cos(0)
==>C=1/√2
So the special solution of the original equation satisfying the initial condition is cosy = cosx / √ 2

Matlab t = 2 * pi * (0:20) / 20 t = 2 * pi * (0:20) difference!

It's a big difference!
The 21 numbers obtained by T = 2 * pi * (0:20) / 20 are 20 times of the 21 numbers obtained by T = 2 * pi * (0:20)
I hope it will help you

Find the derivative dy / DX (1) xy = e to the power of X + y (2) x to the power of y = y to the power of X (3) y = 1 + Xe of the implicit function y determined by the following equation

Take the derivative on both sides, y + XY '= (1 + y') e ^ (x + y), and then move the term and solve y '. Let's try the following solution~

A number minus 5 / 9 is 12. Find the number

This number = 12 ÷ (1-5 / 9) = 27

Q: given that the polynomial AX2 + 2bxy + x2-x-2xy + y about X and Y does not contain quadratic term, what is the value of 5a-8b?
Request to write the specific process. X2 = the square of X

The original formula = (a + 1) x & sup2; + (2b-2) xy-x + y
The first two terms are quadratic
So their coefficient is zero
a+1=0,2b-2=0
a=-1,b=1
So 5a-8b = - 5-8 = - 13

When a bottle is filled with water, the total mass of water and bottle is 120g; when it is filled with alcohol, the total mass of alcohol and bottle is 100g (the density of alcohol is ρ = 0.8 × 103kg / m3). What is the mass of alcohol in the bottle?

Let the volume of the bottle be V, the mass of the bottle be m, ∵ ρ = MV, ∵ the total mass of water and bottle be m + ρ v = M1, i.e. m + 1g / cm3 × v = 120g & nbsp; ①, the total mass of alcohol and bottle be m + ρ v = m2, i.e. m + 0.8g/cm3 × v = 100g & nbsp; ②, the mass of alcohol is m alcohol = ρ V & nbsp; & nbsp; ③, from the solution of ①, ②, ③, m alcohol = 80g; answer: the mass of alcohol in the bottle is 80g

Divide 7 / 12.7/18. And 4 / 9

21 / 36, 14 / 36, 16 / 36 calculate by yourself

How to calculate 5.6 times 11 / 12 minus 5.6 in a simple way?

5.6*11/12-5.6=5.6*(11/12-1)=-5.6/12=-7/15

The application problem of one variable quadratic
There are two piles of bricks. The first pile is 1.2 times of the second pile. If you add 3600 to the second pile, the two piles are the same. How many are there in each pile?

1.21600
two point one eight zero zero zero