Because they calculate and answer is not the same, and can not find the error, please help to see! Xiaohua's mother received a salary of 1750 yuan and an annual bonus of 1000 yuan in January. According to the national regulations, 800 yuan of her monthly income is tax-free. If it is more than 800 yuan, the part below 1300 yuan will pay personal income tax at the rate of 5%; if it is more than 1300 yuan, the part below 3300 yuan will pay personal income tax at the rate of 10%? The correct answer to the exercise book is 170 yuan, but I get 195 yuan. Please write down the detailed steps and results,

Because they calculate and answer is not the same, and can not find the error, please help to see! Xiaohua's mother received a salary of 1750 yuan and an annual bonus of 1000 yuan in January. According to the national regulations, 800 yuan of her monthly income is tax-free. If it is more than 800 yuan, the part below 1300 yuan will pay personal income tax at the rate of 5%; if it is more than 1300 yuan, the part below 3300 yuan will pay personal income tax at the rate of 10%? The correct answer to the exercise book is 170 yuan, but I get 195 yuan. Please write down the detailed steps and results,

Yes, it's 170 yuan. The total salary is 2750 yuan. First of all, if 500 yuan within 800-1300 yuan pays 5% tax, it's 25 yuan. If 1450 yuan within 1300-3300 yuan pays 10% tax, it's 145 yuan. The total salary is 170 yuan

When he finished his homework, he found that the hour hand pointed to between 8 and 8, and the minute hand was a small space behind the hour hand. When he finished his homework, he found that the hour hand pointed to between 8 and 9, and the minute hand just pointed to the opposite direction of the hour hand?

The answer should be 11 out of 33!

Given the function f (x) = - X & # 178; + 2ax-3a, when the maximum value of F (x) in the interval [1,2] is 4
Finding the value of real number a

f(x)=-(x-a)^2-3a+a^2
Discussion a:
When 1=

How to divide seven out of twelve and five out of eighteen

Find the least common multiple of denominator first: 36
Re general score: 21 / 36 + 10 / 36 = 31 / 36

Let x ∈ R, if the minimum value of three functions y = 4x + 1, y = - 2x + 4, y = x + 2 is y = f (x), try to find the maximum value of function y = f (x)

Three equations are established successively
4x+1=x+2
x=1/3,
x+2=-2x+4
x=2/3
4x+1=-2x+4
x=1/2
It can be seen from the image that when x

How to simplify the algorithm of 13.7 times 0.25 times 8

=13.7×（0.25×8）
=13.7×2
=27.4

The image points (- 2, - 1) of quadratic function are known, and when x = 1, the function has the maximum value 2. Find the analytic expression of the function
The analytic expressions of quadratic functions are obtained according to the following conditions;
(1) when the image of quadratic function passes through [- 2, - 1] and x = - 1, the function has the maximum value;
(2) when the symmetry axis of the image of a quadratic function is known to be a straight line x = 1, it intersects the coordinate axis at points [0, - 1], [- 1,0]

(1) When x = 1, the function has a maximum value of 2, which means that the vertex of the function image is (1,2). Therefore, let the vertex formula: y = a (x-1) &# - 178; + 2 substitute (- 2, - 1) 9A + 2 = - 1A = - 1 / 3, the function expression is y = - 1 / 3 (x-1) &# - 178; + 2 = - X & # / 3 + 2x / 3 + 5 / 3 (2) the axis of symmetry is x = 1, let the function expression be y = a (x-1) &#

Water is composed of hydrogen and oxygen. The mass ratio of hydrogen and oxygen is 1:8.100g. How much hydrogen and oxygen are contained in water?

H：100*1/9=100/9g
O：100*8/9=800/9g

Known: a + B = 2, ab = 1, find (1) a & # 178; B & # 178; divide a & # 178; + B & # 178;; (2) (a-b) &# 178;

1、(a²+b²）/a²b²
=【（a+b）²-2ab】/（ab）²
=（2²-2×1）/1²
=2
2、（a-b）²
=（a+b）²-4ab
=2²-4×1
=0

How much is one minus three eighths

1-3/8=5/8
five-eighths