Given a > 1, ab = 2A + B, then the minimum value of (a + 1) (B + 2) is______ ．

Given a > 1, ab = 2A + B, then the minimum value of (a + 1) (B + 2) is______ ．

∵ a > 1, ab = 2A + B, ∵ B ≠ 2, ∵ a = BB − 2 > 1, the solution is b > 2. ∵ a + 1) (B + 2) = AB + 2A + B + 2 = B2B − 2 + 2BB − 2 + B + 2 = B2 − 4 + 4B − 2 + 2 (B − 2) + 4B − 2 + B + 2 = 2 (b-2) + 8b − 2 + 10 ≥ 22 (B − 2) · 8b 2 + 10 = 18 if and only if B = 4. Therefore, the minimum value of (a + 1) (B + 2) is 18

The ratio of a and B is 9:2. The number of a is 56 more than that of B. how much is a and how much is B?

"Zhang Yujia 1998":
Let this number be x, and the equation is as follows:
（9x／11）-（2x／11）＝56
7x／11＝56
7x＝616
x＝88
A: a = 88 × 9 / 11 = 72
B = 88 × 2 / 11 = 16
Checking calculation: 72-16 = 56
The calculation is correct. Good luck. Good bye

Let AX = 0, if R (a) = 1, then the number of solution vectors in the basic solution system is a 1 B 2 C 3 D 4

The number of vectors of basic solution system is N-R (a) = 5-1 = 4

Party A and Party B process a batch of parts at the same time. Party A's task is Party B's 23. Party A processes 60 parts per hour and Party B processes 80 parts per hour. When Party A completes the task, Party B has 120 parts left. How many parts are there in total?

Let a complete the task in X hours, then a's task is 60x, B's task is 80x + 120; 60x = (80x + 120) × 23180x = 160x + 240 & nbsp; 20x = 240 & nbsp; & nbsp; X = 1260 × 12 + 80 × 12 + 120 = 1800. A: there are 1800 parts in this batch

1.7x = x + 42 to solve the equation

1.7x=x+42
1.7x-x=42
0.7x=42
x=60

The ratio of grain stored in warehouse A and warehouse B is 8:7. If 1 / 4 of grain is transported from warehouse A and 8 tons are transported into warehouse B, then warehouse B has 17 tons more grain stored in warehouse A than warehouse a
How many tons of grain

Equation: let B 7x tons, a 8x tons. 8x-8 / 4x + 17 = 7x + 8 6x + 17 = 7x + 8 x = 9, a: 8x = 8 × 9 = 72, B: 7x = 7 × 9 = 63

Fill in the blanks of science questions (27 20:9:56)
The genetic material in the nucleus of the nucleus is mainly the genetic material in the nucleus of the nucleus of the genetic material in the nucleus of the nucleus of the genetic material in the nucleus of the nucleus of the nucleus of the genetic material in the nucleus of the nucleus of the nucleus of the genetic material in the nucleus of the nucleus of the nucleus of the nucleus of the cells of the cells, which is mainly the genetic material in the nucleus of the nucleus of the nucleus of the nucleus of the nucleus of the cells, which is 35;##j \\35\#35\35; ;; \\35\#######\\\\\\\\\\
Is a hair cell composed of a single cell or multiple cells?
The damaged tomato is easy to rot in summer
 

The genetic material in the nucleus is mainly chromatin, and the genetic material in chromosome or chromatin is DNA
Is a hair cell composed of a single cell or multiple cells?
A hair cell is a cell
The damaged tomato is easy to rot in summer. According to the structure of organism, the main reason is that the epidermis of tomato fruit has protective effect

A few math problems
Simple operation, to process
1:6 1 + 2:12 1 + 3:20 1 + 4:30 1 + 5:42 1 + 6:56 1 + 7:72 1 =?

1 1 / 6 + 2 1 / 12 + 3 1 / 20 + 4 1 / 30 + 5 1 / 42 + 6 1 / 56 + 7 1 / 72
=（1+2+3+4+5+6+7）+1/6+1/12+1/20+1/30+1/42+1/56+1/72
=28+（1/6+1/12）+（1/30+1/42）+（1/56+1/72）+1/20
=28+（1/4+1/20）+12/210+16/504
=28+3/10+12/210+16/504
=28 16 / 54

It is known that all items of the equal ratio sequence {an} are positive numbers, A1 = 2, and the sum of the first three terms is 14. (1) the general term formula of {an}?
2) Let BN = log2an, find the sum of the first 99 terms of the sequence {BN}?

Solution (1) let the common ratio of the equal ratio sequence {an} be q, a1 + A2 + a3 = 14a1 + a1q + a1q & # 178; = 14 reduce to Q & # 178; + q-6 = 0, and solve to q = 2 or q = - 3 ({an} is a positive number, so it is omitted). Therefore, an = a1q ^ (n-1) = 2 * 2 ^ (n-1) = 2 ^ N2) BN = log2an = log2 ^ n = n s99 = n (n + 1) / 2 = 99 * 100 / 2 = 4

Simple calculation of 41.2 * 8.6 + 3.9 * 41.2-21.2 * 12.5

41.2*8.6+3.9*41.2-21.2*12.5=41.2*（8.6+3.9）-21.2*12.5=41.2*12.5-21.2*12.5=（41.2-21.2）*12.5=20*12.5=250