Write words quietly Write four

Write words quietly Write four

Wu Qianwei,
Answer: gently, slowly and quietly
☆☆☆☆ ☆☆☆☆
★★ ★ ★★
☆☆ ☆☆
★★ ★★
☆☆ ☆☆
★★ ★★
☆☆ ☆☆
★★ ★★
☆☆
Pro*^__ ^*Thank you very much!

What can a, B and C in quadratic function y = ax & # 178; + BX + C be used to judge?

A represents the coefficient of quadratic term and the opening direction of quadratic function. If a > 0, the opening is upward

Given that the minimum value of the function y = 4x2-4ax + (a2-2a + 2) in the interval [0,2] is 3, find the value of the real number a

The axis of symmetry of function = 4x2-4ax + (a2-2a + 2) is x = − 4a2 × 4 = 12a. ① when A2 ∈ [0, 2], that is, 0 ≤ a ≤ 4, the minimum value of function is the ordinate of the vertex of parabola, so the minimum value of function is y = - 2A + 2. From - 2A + 2 = 3, the solution is a = − 12, which does not hold

Given a = (√ 3 + √ 2) 2, B = (√ 3 - √ 2) 2, find the value of a2-3ab + B2
Wrong number, known a = (√ 3 + √ 2) &# 178;, B = (√ 3 - √ 2) &# 178;
, find the value of a & # 178; - 3AB + B & # 178

Solution
ab=(√3+√2)²(√3-√2)²=[(√3)²-(√2)²]²=1
a+b=(√3+√2)²+(√3-√2)²=5+2√6+5-2√6=10
∴
a²-3ab+b²
=(a+b)²-5ab
=10²-5×1
=100-5
=95

As shown in the figure, at the isosceles right angle △ ABC, ∠ C = 90 °, AC = BC, D is any point on AB, AE ⊥ CD is at e, BF ⊥ CD intersects the extension line of CD at F, CH ⊥ AB is at h, intersects a
G. Verification: ① BD = CG, ② DF = Ge

It is proved that in △ CHD and △ FDB, ∠ ADC = ∠ CDB, ∠ CHB = ∠ CFB = 90, ｜ HCD = ∠ DBF, while AC = BC, CH ⊥ AB, ∠ cab = = ∠ CBA = ∠ ACh = 90, and ∠ ace = ∠ ACh + ∠ HCD = 45 + ∠ HCD, ∠ CBF

How many kilos is three tons?

One ton 1000 kg, three tons 3000 kg

A rectangular playground is 50 meters long and 30 meters wide. After the expansion, its length and width have increased by 10 meters, so how many square meters has its area increased?

Original area 50 * 30 = 1500
Area after reconstruction: 60 * 40 = 2400
Increase area 2400-1500 = 900

If the three sides of △ ABC are integers, the perimeter is 11 and one of them is 4, then the maximum side length of △ ABC is ()
A. 7B. 6C. 5D. 4

Let the maximum side length of the triangle be a and the minimum side be B. according to the known, we get a + B = 7. According to the trilateral relationship of the triangle, we get A-B < 4. When A-B = 3, we get a = 5 and B = 2. So we choose C

Xiao Ming's money is four times of Xiao Fang's, Xiao Ming spent 60 yuan, Xiao Fang spent 16 yuan, and Xiao Ming's remaining money is five times of Xiao Fang's
Can it be solved without equation?

Let Xiao Fang have X Yuan and Xiao Ming have 4x yuan
4X-60=5（X-16)
X=140
Total 140 * (1 + 5) = 840 yuan
They had 840 yuan in total

Each graph is a pattern composed of several potted flowers, such as two triangles. Each edge (including two vertices) has n (n ≥ 2, which is an integer) potted flowers. The total number of potted flowers in each pattern is s
(1) What is the value of s when n = 6?
(2) We use the formula containing n to express s
0
0 0
0
n=2,s=4
0
0 0
0 0 0
0 0
0
n=3,s=9
0
0 0
0 0
0 0 0 0
0 0
0 0
0
n=4,s=14

(1)24
(2)s=n+(n-2)*2*2+2=5n-6