(1) Given that the integer part of √ 7 is x and the decimal part is y, find the value of Y (√ 7 + x)

√4

Junior high school math problems
The opening direction is the same as the opening size y = 3x, and the relation of the parabola with the vertex at (0,3) is_____ .
I don't understand. It's different. Bring it in

y=3x^2+3
If the opening direction and size are the same, it means that the original parabola is translated, and the vertex is at (0,3)
So it's y = 3x ^ 2 + 3

1. If the square of fraction A / 12-3a is negative, then the value range of a is negative
2. Substitute x = 2 / 3 into y = - 1 / x value as y ', substitute x = y' + 1 into the original inverse proportion function, and then substitute x = y '= 1 into the element inverse proportion function to get y' ', so that the 2010' of y can not be over presented

1. If the square of fraction A / 12-3a is negative, then the value range of a is negative
Because the square of a / 12-3a is negative
The square of a is greater than or equal to zero
So 12-3a is less than zero
The solution a is greater than 4
2. Substitute x = 2 / 3 into y = - 1 / x value as y ', substitute x = y' + 1 into the original inverse proportion function, and then substitute x = y '= 1 into the element inverse proportion function to get y' ', so that 2010' of Y are?

When a commodity is sold at its original price, the profit is one third of the cost. Later, it is sold at a 10% discount, and the daily sales volume has doubled (doubled or tripled)?
A shop bought 360 pieces of glass products from other places, 40 of them were damaged during transportation, and the rest were sold at 117% of the purchase price?

1. The method of the equation: suppose the profit is x, then the cost is 3x, the selling price is 4x, and the sales volume is y. according to the meaning of the question: the original profit = 4xy-3xy = XY. According to the meaning of the question: the current sales volume is 2Y, then: 2 × 0.9 × 4xy-2 × 3xy = 1.2xy1.2-1 = 0.2 = 20%. A: after the discount, the total profit of this commodity every day increases by 20% compared with that before the discount

When a commodity is sold at the original price, the profit is 13% of the cost. Later, it is sold at a 10% discount, and the daily sales volume is doubled. After the discount, the daily total profit of this commodity is increased compared with that before the discount______ %．

Suppose the cost is 1 and the original sales volume is a, then the original selling price is 1 + 13 = 43, the price after 10% discount is 43 × 90% = 1.2, the profit after discount is 1.2-1 = 0.2; the sum of the original profits is 13a, the profit after doubling the sales volume is 0.2 × 2A = 0.4A, the more percentage is: (0.4a-13a) △ 13a, = (25-13) △ 13, = 115 △ 13, = 20%; a: the total profit of this commodity after discount is lower than that of other commodities The answer is: 20

The full score of a math test is 100, and the average score of 36 students in the class is 92. If the scores of a, B, C and D are removed, the average score of the rest is 91, then what is the score of C in this test?

The total score of 36 students is 92 * 36 = 3312
The total score of 32 students except a, B, C and D was 91 * 32 = 2912
So the sum of the scores of the four is 3312-2912 = 400
The full mark is 100
So a = b = C = D = 400 / 4 = 100
So C is 100 points

In a math test, 16% of the students get 100 points, and 24% of the students get 90-99 points. There are four less students get 100 points than 90-99 points. How many students are there in this class?

Students with 100 scores are 24% - 16% = 8% less than those with 90-99 scores,
There are four less students with a score of 100 than those with a score of 90-99,
Therefore, there are 50 students in this class

In a math test, the average score of the whole class is 91.2. There are 21 girls, 92 points on average, and 90.5 points on average for boys. There are () boys in this class
A. 26B. 25C. 24D. 23

(92-91.2) × 21 ^ (91.2-90.5) = 0.8 × 21 ^ 0.7 = 16.8 ^ 0.7 = 24 (people). Answer: there are 24 boys in this class

In a math test, the average score of the whole class is 91.2. There are 21 girls, 92 points on average, and 90.5 points on average for boys. There are () boys in this class
A. 26B. 25C. 24D. 23

(92-91.2) × 21 ^ (91.2-90.5) = 0.8 × 21 ^ 0.7 = 16.8 ^ 0.7 = 24 (people). Answer: there are 24 boys in this class

In a math test, the average score of the whole class is 91.2. It is known that there are 21 girls, the average score of girls is 92, and the average score of boys is 90
Do not use the equation (> ^ ω)^

The average score of each female student is higher than that of the whole class: 92-91.2 = 0.8, the average score of each male student is lower than that of the whole class: 91.2-90.5 = 0.7, the total score of 21 female students is higher than that of the whole class: 0.8 * 21 = 16.8, so the average score of the whole class can reach 91.2 only when the male student is 16.8 / 0.7 = 24

(1) Given that the integer part of √ 7 is x and the decimal part is y, find the value of Y (√ 7 + x)