Use the five numbers 2,7,0,5,1 to form a five digit number. (1) what is the smallest number about 30000? (2) about 7 Use the five numbers 2, 7, 0, 5 and 1 to form a five digit number (1) What is the minimum number of 30000? (2) What is the largest number about 70000? Ask for detailed explanation!

About 30000, the smallest is 25017
About 70000, the largest number is: 72510, don't spray

It is known that a / 4 / 5 = B / 2 = C × 4 / 5 = D × 100%, and a.b.c.d is not equal to 0. The four numbers of a.b.c.d are arranged in the order from large to small

Let d = 1, then a = 4 / 5; b = 2; C = 5 / 4; so b > C > d > a

If we know that a △ = B × = C × = D ×, and that a, B, C and D are not equal to 0, what is the size relationship of a, B, C and D?

The original title should be: given a △ 4 / 5 = B × 6 / 7 = C × 4 / 9 = D × 8 / 8, and ABCD is not equal to 0, then what is the size relationship of ABCD?
1) Suppose a △ 4 / 5 = B × 6 / 7 = C × 4 / 9 = D × 8 / 8 = K
a=4k/5,b=7k/6,c=9k/4,d=k
a:b:c:d=48:70:135:60
The size relation of four numbers
k> 0, a, B, C, D are positive numbers, a

According to the following equation, arrange the four numbers a, B, C and D in descending order. (a, B, C and D are not 0) a × 56 = B × 32 = C × 45 = D × 38 ＞＞＞ What I found:__ ．

Let a × 56 = B × 32 = C × 45 = D × 38 = 1, then a × 56 = 1, a = 65 = 7260, B × 32 = 1, B = 23 = 4060, C × 45 = 1, C = 54 = 7560, D × 38 = 1, d = 83 = 16060, because 16060 ＞ 7560 ＞ 7260 ＞ 4060, that is 83 ＞ 54 ＞ 65 ＞ 23, so D ＞ C ＞ a ＞ B

According to the following equation, arrange the four numbers a, B, C and D in descending order. (a, B, C and D are not 0)
5 3 4 3
A ×-- = B ×-- = C ×-- = D × -- Q: () > () > () > ()
6 2 5 8
Arrange the four numbers a, B, C and D in descending order according to the following equation. (a, B, C, D are not 0)
5 3 4 3
a × ― ＝ b× ― ＝ c ×― ＝ d ×―
6 2 5 8

Fill in the blanks is the easiest
Let a * (5 / 6) = b * (3 / 2) = C * (4 / 5) = D * (3 / 8) = P
P is impossible = 0,
Then a = (6 / 5) P
b=(2/3)p
c=(5/4)p
d=(8/3)p
therefore
When p > 0
d>c>a>b
When PA > C > d

There are four numbers a.b.c.d (all a.b.c.d are not 0) which satisfy the equation a * 1 / 2 = b * 2 / 3 = C * 4 / 5 = D. please arrange the four numbers a.b.c.d from small to large
Please list the formula. Don't set D = 8

Multiply both sides of the equation by 30
15A = 20b = 24C = 30d, we can see that: a > b > C > D
The answer is: D

Divide 175 into the sum of four numbers a, B, C and D, so that the four numbers a, b.c.d satisfy the following equation: a + 4 = B-4 = C * 4 = D / 4 ask a, B, C and D what are they equal to?
Please write down the detailed equation and how to calculate it

A + 4 = B-4 = C * 4 = D / 4
B=A+8
C=(A+4)/4
D=4(A+4)
A+B+C+D=175
A+A+8+(A+4)/4+4(A+4)=175
Solution
A=24
B=24+8=32
C=(A+4)/4=7
D=4(A+4)=112

Given that A.B is opposite to each other, and ab is not equal to 0, C.D is reciprocal to each other, | x | = 2, find the value of C ^ 100 × d ^ 100-2009 (a + B + B / a) x + x ^ 2

Because a and B are opposite numbers,
So a + B = 0,
So B / a = - 1
Because C and D are reciprocal,
So CD = 1
Because the absolute value of X is 2
So x = 2 or x = - 2
So C ^ 100 × d ^ 100 - 2009 (a + B + B / a) x + x ^ 2
=（cd）^100 - 2009(a + b + b/a)x + x^2
= 1^100 - 2009(0 - 1)x + 4
= 5 + 2009x
=4023 or - 4013

Given that a and B are opposite to each other, C and D are reciprocal to each other, and a is not equal to zero, find a + B / 100 * a + (A / b) ^ 2012 - (c * d) ^ 2011

A and B are opposite numbers, so a + B = 0
C and D are reciprocal, so CD = 1
(a+b)/100*a+(a/b)^2012-(c*d)^2011
=0+1-1
=0

A and B are opposite to each other. B and C are reciprocal to each other. The square of D is equal to 4. Find - 2BC + A + B / BC

A and B are opposite numbers, a + B = 0
B and C are reciprocal, BC = 1
The square of D is 4, d = 2 or - 2
-2bc+a+b/bc
=-1+0/1
=-1

Use the five numbers 2,7,0,5,1 to form a five digit number. (1) what is the smallest number about 30000? (2) about 7 Use the five numbers 2, 7, 0, 5 and 1 to form a five digit number (1) What is the minimum number of 30000? (2) What is the largest number about 70000? Ask for detailed explanation!