If LXL = 2, Lyl = 3 and XY is greater than 0, then x + y = (), xy = ()

If LXL = 2, Lyl = 3 and XY is greater than 0, then x + y = (), xy = ()

X + y = 5 or - 5
xy=6

Given x + Y-2 √ x-4 √ y + 5 = 0, find the value of real number XY

x +y-2√x-4√y+5=0
(√x)²+(√y)²-2√x-4√y+5=0
(√x)²-2√x+1+(√y)²-4√y+4=0
(√x-1)²+(√y-2)²=0
(√x-1)²=0 (√y-2)²=0
√x=1 √y=2
x=1 y=4
xy=4

Bus 55 people a day 500 people, minibus 45 people a day 450.210 people, how to rent a car to save money? How much is the rent

This one says to the child:
Big car is cheaper than small car, so I rent big car
210 divided by 55 has remainder
55 * 3 = 165
210 - 165 = 45
45 / 45 = 1
So rent three big cars and one small car
500 * 3 +450 = 1950

When 80% of a rope is used and 20 meters is connected, the length of the rope is 60% of the original total length. How long is the rope?

20÷[ 60%-（1-80%）]
=20÷40%
=50 (m)

Matlab matrix multiplication to get 1.0e + 004 * What do you mean

The value obtained is too large, so it is expressed by scientific counting method. 1.0e + 004 is the fourth power of 10,
That is to say, all the values in your result must be multiplied by 10000 in the end, which is the real value
If you don't want to use scientific counting, type it in the command window
format long g
That's it

The students from the math interest group of class 2 of Grade 7 rent a car to take part in social practice activities. It is estimated that the per capita rental fee is 16 yuan, and then there are three other students
With the participation of students, the car rental fee remains unchanged. As a result, each student can be reduced by 3 yuan. Suppose there were X students, the equation can be set as follows_______ .

16x＝（x＋3）×（16－3）
x=13

Tan (x + y) = 2tanx (x, x + y ≠ K π + π / 2, K ∈ z), prove 3siny = sin (2x + y)
If you answer right, you will be rewarded!

Let a = x + y, B = xtan (x + y) = 2tanxina / cosa = 2sinb / cosb2sinb cosa = Sina cosb3siny sin (2x + y) = 3sin (a-b) - sin (a + b) = 2sina cosb-4cosa SINB = 4sinb cosa-4cosa SINB = 03siny = sin (2x + y)

The square of (a + 2ab-c) is made by the complete square formula

(a+2ab-c)²
=(a+2ab)²-2(a+2ab)c+c²
=a²+4a²b+4a²b²-2ac-4abc+c²
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The meaning of life lies in learning
Some people say "the meaning of life is to study", but what do I think is wrong?

the meaning of life lies on learning.
Study is mainly research

How fast is 15 dimes

15 dimes equals 30, one yuan equals 10, so it's 3 yuan