103+104+105+106+107+108+109+110+111+112+113+114=( )x( )=( )

103+104+105+106+107+108+109+110+111+112+113+114=( )x( )=( )

103+104+105+106+107+108+109+110+111+112+113+114
=(103+114)x(114-103+1)/2
=(217 )x( 6)=(1302 )

How to add operation symbols to 4 5S to be equal to 24

5*5-5/5=24

The following can be calculated by square difference formula is () a (- x + y) (X-Y) B. (x-1) (- 1-x) C. (2x + y) (2y-x) d. (X-2) (x + 1)
2. Calculate the power of (- 5 / 12) × (- 2 / 5) = () A. - 1 B.1 c.0 d.1997
&Given that the power a of X is 3 and the power B of X is 5, then the power 3a-2b of X is () A.15 b.9/10 c.3/5 d.27/25

1、B：（x-1）（-1-x）=-（x-1）（1+x）=-（x²-1²）
2、B：（-5/12）^2005×（-2 2/5）^2005=（-5/12 × -12/5）^2005=1^2005=1
3、D：X^(3A-2B)=(X^A)^3 / (X^B)^2=3^3 / 5^2 =27/25

The composition of bases in all nucleic acids of the following organisms is as follows: purine bases account for 58% of the total number and pyrimidine bases account for 42% of the total number
A. Bacteriophage T2 B. tobacco mosaic virus C. bacteria D. yeast and human

A. Bacteriophage belongs to DNA virus, which contains only one kind of DNA nucleic acid. According to the principle of base complementary pairing, the total number of purine bases of bacteriophage should be equal to the total number of pyrimidine bases

The store has delivered a batch of refrigerators, 5 / 6 of which have been sold, which is exactly 150 sets. How many refrigerators have the store delivered in total?

150 △ 5 / 6 = 180 sets

How to do the third question "life practice" on page 65 of mathematics summer homework book of grade 5 Volume 2?

Teachers generally do not check, I did not write at that time, you look so serious, really good students

How to solve 4 * 10x + [(x + 1) - 2] - [10x + (x + 1)] = 58
Write clearly step by step

40X+X-1-(11X+1)=58
41X-1-11X-1=58
30X=60
X=2

Simple calculation: 0.034 × 0.5 × 0.6

0.034*0.5*0.6
=0.034*0.03
=0.00112

1. Known a ^ 2 + A + 1 / 4 = 0. Find (a ^ 3-1) / (a ^ 5 + A ^ 4-A ^ 3-A ^ 2)
2. If the equation (x + a) (x + b) + (x + b) (x + C) + (x + C) (x + a) = 0 has two equal roots, prove a = b = C
3. Solve the equations
① Root x + root (x + 7) + 2 root (x ^ 2-7x) = 35-2x, ② x + y + xy = 19, x ^ 2 + y ^ 2 = 25

1. Known a ^ 2 + A + 1 / 4 = 0. Find (a ^ 3-1) / (a ^ 5 + A ^ 4-A ^ 3-A ^ 2), from known: (a + 1 / 2) 2 = 0, then: a = - 1 / 2, then calculate: (a ^ 3-1) / (a ^ 5 + A ^ 4-A ^ 3-A ^ 2) = 12
2. It is known that the equation has two equal roots. After the expansion of the equation, the coefficient of x ^ 2 term is 3, the coefficient of X term is 2 (a + B + C), and the coefficient of constant term is ab + BC + ca
A ^ 2 + B ^ 2 + C ^ 2-ab-ac-bc = 0, multiply the left and right sides by 2 at the same time, get 2A ^ 2 + 2B ^ 2 + 2C ^ 2-2ab-2ac-2bc = 0, formula, get (a-b) ^ 2 + (B-C) ^ 2 + (C-A) ^ 2 = 0, so a = b = C
3. Are you sure it's not root (X-7)? It's a little complicated and meaningless
② If x ^ 2 + y ^ 2 = 25, x + y + xy = 19 and x ^ 2 + y ^ 2 + 2XY + 2x + 2Y = 63, then:
(x + y) ^ 2 + 2 (x + y) - 63 = 0, the solution is x + y = 7 or x + y = - 9. If x + y = - 9, then x and y are different sign and do not satisfy x + y + xy = 19, so x + y = 7, xy = 12, the solution is x = 3, y = 4 or x = 4, y = 3

The original price of each recorder was 500 yuan, but now it's 350 yuan. What's the price reduction?

(500-350) △ 500, = 150 △ 500, = 30%; answer: reduce the price by 30%