If the line Y-3 = 0 is parallel to the line (3a-1) x + Y-1 = 0, then the real number a is equal to

If the line Y-3 = 0 is parallel to the line (3a-1) x + Y-1 = 0, then the real number a is equal to

Y = 3 parallel to X axis
That is, the coefficient of X is 0
So 3a-1 = 0
a=1/3

If A-1 = 1 / (A-2), simplify (2a ^ 4-7a ^ 3 + 2A ^ 2 + 3a-3) / (a ^ 2 + 1)

If A-1 = 1 / (A-2),
(a-1)(a-2)=1
a^2-3a+2=1
a^2+1=3a
Simplification (2a ^ 4-7a ^ 3 + 2A ^ 2 + 3a-3) / (a ^ 2 + 1)
=(2a^4+2a^2-7a^3-7a+10a-3)/(a^2+1)
=(2a^2(a^2+1)-7a(a^2+1)+10a-3)/(a^2+1)
=(2a^2*3a-7a*3a+10a-3)/(3a)
=(6a^3-21a^2+10a-3)/(3a)
=(6a^3+6a-21a^2-21+4a+18)/(3a)
=(6a*3a-21*3a+4a+18)/(3a)
=(18a^2-63a+4a+18)/(3a)
=(18*(a^2+1)-59a)/(3a)
=(18*3a-59a)/(3a)
=(-5a)/(3a)
=-5/3

If the sides of △ ABC are all integers, the perimeter is 11, and one side is 4, then the maximum side length of the triangle is ()
A. 7B. 6C. 5D. 4

Let the maximum side length of the triangle be a and the minimum side be B. according to the known, we get a + B = 7. According to the trilateral relationship of the triangle, we get A-B < 4. When A-B = 3, we get a = 5 and B = 2. So we choose C

A calculation problem requires the square of a number, plus 5 minus 9, and then divided by 3. And the small square takes the square as a multiplication of 2 to calculate, the result quotient is 3 more than 1, please

According to the calculation of Xiao Fang:
Set this number to X
2X+5-9=3×3+1
X=7
The number is seven
The correct result is (7 & sup2; + 5-9) △ 3 = 15

Nine trees, three in each row, just ten rows? Please draw a picture

.1.2.3.
.
.4..5..6.
.
.7.8.9.
Supplementary note: 123 connected, 456 connected, 789 connected;
148 connected, 368 connected, 247 connected, 269 connected;
159357258 are also connected! OK! Ten lines!

Which plants reproduce from roots

Many plants can reproduce in many ways
Sweet potato, chrysanthemum, dripping Guanyin, pear, apple and fig can be rooted and propagated. There are also some bulb flowers like tulip

What does simplification mean
For example: 6A + 13A simplification
Give me a try on how to do it best. Give me some more examples. Thank you

6A + 13A = (6 + 13) a = 19A, understand? That is to say, if there is a same number or letter before and after an equation, it can be combined into one. For example, the question of 13x14 + 13x28 can be written as: 13x14 + 13x28 = 13X (14 + 28) = 13x42 = 546. For another example, 3A = 7a-10 equals 7a-3a = 10, (7-3) a = 10, 4A = 10, a = 2.5?

The following is the plan of a trapezoidal plot. Find out its actual area. The top bottom is 4, the height is 5, the bottom is 6, and the scale is 1:200

Trapezoid area = (upper bottom + lower bottom) * height / 2
=[(4+6)*200]*5*200/2
=[(4+6)*5/2]*200^2
=10^6

My campus composition has 30 words at the end and 20 words at the beginning~~

At the beginning
Walking in the journey of life, the campus is nothing more than a place we are most familiar with. It carries our dreams and is the cradle of our growth. Now, let me take you to take a look at the campus with me. (kindergarten version)
ending.
This is my campus. It is the place where my dream is born. With it, my dream can sprout and finally harvest the best life
If you need something better, just say it and deal with it

If a + B = 2012, A-B = 1, then A2-B2=______ ．

A2-B2 = (a + b) (a-b), ∵ a + B = 2012, A-B = 1, ∵ A2-B2 = (a + b) (a-b) = 2012 × 1 = 2012