(1) Given x + y = a, find (x + y) &# 179; (2x + 2Y) &# 179; (3x + 3Y) &# 179;

(1) Given x + y = a, find (x + y) &# 179; (2x + 2Y) &# 179; (3x + 3Y) &# 179;

Hello!
（x+y）³（2x+2y）³（3x+3y）³
=（x+y）³*4（x+2）³*27（x+y）³
=108(x+y)³
=108a³
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Given x + y = a, try to find the value of (x + y) 3 (2x + 2Y) 3 (3x + 3Y) 3

（x+y）3（2x+2y）3（3x+3y）3，=（x+y）3[2（x+y）]3[3（x+y）]3，=（x+y）3•8（x+y）3•27（x+y）3，=216（x+y）9，=216a9．

Given the points a (1,2). B (3,4), the equation for finding the vertical bisector of line AB is obtained

The slope of AB is (4-2) / (3-1) = 1
Vertical slope is negative reciprocal
So the slope of the vertical bisector of AB is - 1
The midpoint of AB is [(1 + 3) / 2, (2 + 4) / 2], that is, (2,3)
So Y-3 = - 1 × (X-2)
That is, x + Y-5 = 0

Given that the sum of monomial 0.25x ^ my ^ C and -0.125xy is 0.625ax, find the value of ABC
If the problem is not clear, I can continue to describe. The result is not the most important, the important thing is the process and understanding

The sum of 0.25x ^ my ^ C and -0.125xy is 0.625ax, which indicates that 0.25x ^ my ^ C and -0.125xy are similar terms, so XY index is the same, that is, M = C = 1, and 0.25-0.125 = 0.625a, so a = 0.2

Huanhuan read a story book. On the first day, she read 13 pages of the whole book, on the second day, she read 20 pages, on the third day, she read the remaining 14 pages, and on the third day, she left 38 pages of the whole book? (2) How many pages are left to read?

(1) Suppose there are x pages in this book, from the meaning of the title: (x-13x-20) × (1-14) = 38x, & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; (23x-20) × 34 = 38x, & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp

(2a squared b-5ab) - 2 (- AB-A squared b) fast answer at least 3 steps

（2a²b-5ab)-2(-ab-a²b)
＝2a²b-5ab+2ab+2a²b
=(2a²b+2a²b)+(-5ab+2ab)
=4a²b-3ab

From a to B, it takes five hours for a bus and four hours for a car?

100 is the percentage
100÷5=20
20 is the common quotient of 4 and 5
1、4x20=80
2、5x20=100
80 out of 100 = 80%

Given the absolute value of M of (m-2) x to the second power, then + 3M = 15, find the value of M

(m-2)x^(|m|-2)+3m=15
Is there another condition for the problem? This is a linear equation with one variable
In this case, the solution is m = 3 or - 3

A train from city a to city B runs three eighths of the whole journey in four hours. At such a speed, how many parts of the whole journey can it take in eight hours? How many parts are not finished?

Six out of eight. Four out of eight

At 1, 2, 3 In 499 and 500, the number 2 appears______ Times

There are 20 in 1-99 (22 has 2 2), 20 in 100-199, 100 in 200-299 (2 in 100), 20 in 20 (2 in 10), 20 in 300-399 (322 has 2 2), and 20 in 400-499 (422 has 2 2). Therefore, a total of 20 × 4 + 100 = 200