Y = x square - 8x + 17

Y = x square - 8x + 17

y=x²-8x+17
=(x²-8x+16)+1
=(x-4)²+1

The area of a trapezoid is 110 square centimeters, its height is 2.2 decimeters, its bottom is 8.8 centimeters, and its top is ()

Height = 2.2 decimeters = 22 cm
Top and bottom
=Area × 2 △ height - bottom
=110×2÷22-8.8
=10-8.8
=1.2 cm

In △ ABC, ∠ BAC = 106 °, EF and Mn are the vertical bisectors of AB and AC respectively, BC = 10cm. Calculate the degree of ∠ EAM and the perimeter of △ AEM

∵ EF and Mn are AB.AC The vertical bisectors, AEB and AMC, are isosceles triangles, B = BAE, C = Mac, B = be, am = cm, BC = be + Em + MC = 10 cm. The perimeter of AEM is AE + Em + am = be + Em + MC = BC = 10 cm

Solve the equation: the square of (2x + 3) - 25 = 0

The square of (2x + 3) - 25 = 0
Square of (2x + 3) = 25
2X + 3 = plus or minus 5
1、2x+3=5
2x=2
x=1
2、2x+3=-5
2x=-8
x=-4

The sun is bigger than the earth, the moon is bigger than the stars, what are the stars bigger than?
What are the stars bigger than?

Orangutans seem to be bigger than monkeys!

When deriving the area formula of parallelogram, parallelogram can be transformed into () shape by cutting and complementing translation

Rectangle

It is known that the square of (X-15) is 169, and the cube of Y is 8 = 0

（x-15）^2=169
x-15=±13
x=15±13
X = 28 or x = 2
y^3+8=0
y^3=-8
y=-2
x+y=28-2=26
Or 2-2 = 0
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There is a trapezoidal experimental field. On a map with a scale of 1:2000, it is measured that its upper bottom is 2.5 cm, its lower bottom is 4 cm, and its height is 2 cm. So it is necessary to find the experimental field

Find the actual length first
Top and bottom = 2.5cm × 2000 = 5000cm = 50m
Bottom = 4cm × 2000 = 8000 cm = 80m
Height = 2cm × 2000 = 4000cm = 40m
Area = (50 + 80) × 40 △ 2 = 130 × 20 = 2600 square meters
The experimental field covers an area of 2600 square meters

Mathematician story 100 ~ 200 words

When Gauss was in primary school, once after the teacher taught addition, because the teacher wanted to have a rest, he asked the students to calculate. The topic was: 1 + 2 + 3 +. + 97 + 98 + 99 + 100 = the teacher was thinking, now the children must count until the end of the class! When he was about to borrow it, Gauss stopped him! Originally, Gauss had figured it out, Do you know how he calculates it? Gauss tells you how he calculates it: add 1 to 100 and 100 to 1 in two rows, that is, 1 + 2 + 3 + 4 +. + 96 + 97 + 98 + 99 + 100 100 + 99 + 98 + 97 + 96 +. + 4 + 3 + 2 + 1 = 101 + 101 + 101 +. + 101 + 101 + 101 + 101 + 101, there are 100 101 in total, but the formula is repeated twice, So divide 10100 by 2 to get the answer, which means that the learning process of Gauss primary school has already surpassed other students since then, which has laid the foundation for his future mathematics and made him a mathematical genius! I can concentrate on it

3.3 square meters = () square meters () square decimeters

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