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When using discriminant method to find the range of function, how to judge whether the quadratic coefficient of discriminant is equal to 0?
Don't worry about it
Just solve it according to the quadratic inequality of one variable
If the absolute value of A-3 and (a + b) &# 178; are opposite numbers, then the value of algebraic formula-2a & # 178; B is ()
1: If the absolute value of A-3 and (a + b) &# 178; are opposite numbers, then the value of the algebraic formula-2a & # 178; B is ()
2: Linking AC and ad in Pentagon ABCDE
(1) It shows that AC and ad divide ∠ BAE into three equal parts
(2) Is △ ACD an isosceles triangle? Why?
Because the result of absolute value and square is nonnegative
If it is the opposite number, it is only possible that both results are equal to 0
So A-3 = 0, a = 3
a+b=0,b=-3
After - 2A and 178; b = - 2 * 9 * (- 3) = 54
As shown in the figure, in rectangular ABCD, AE is perpendicular to BD at e, diagonal lines AC and BD intersect at O, and be ratio ed = 1:3, ab = 6cm?
12cm drawing
Because be: ed = 1:3 o, divide BD equally
So be: Bo = 1:2
So e is the midpoint of ob
AE vertical ob
So triangle OAB is isosceles triangle
So OA = AB = 6cm
So AC = 2oa = 12cm
OVER.
Simple calculation of 99 * 99 * 199
Urgent need
99)*99*199
=99*(100-1)*199
=99*(19900-199)
=(100-1)*19701
=1970100-19701
=1950399
Sentence translation (fill in the words according to the contents in brackets)
We go to school (from Monday to Friday)
We go to school ____ ____ ____ ____ .
I like English best
I ____ English ____ .
It's hard to be a movie star
It's ____ ____ to be a movie star.
I think Beijing Opera is very interesting
I ____ Beijing Opere is very ____ .
His father is not good at cooking
His father ____ ____ ____ cooking.
Mike likes to make friends with different people
Mike likes ____ ____ with different people.
⑴I want to buy a pair of ____ .
A:coats B:photo C：fish
⑵A sister of ____ is a very good nurse.
A：I B：my C：mine
⑶Could you have ____ rice,please?
A：some B：any C：a
We go to school (from Monday to Friday)__ from__ __ Monday__ __ to__ __ Friday__ I like English best__ like__ English __ best__ It's hard to be a movie star__ very__ __ difficult__ to be a movie s...
A trapezoid is 6cm long. If its upper bottom is extended by 4cm, it will become a parallelogram. The area of the trapezoid is increased by 10 cm2. The area of the original trapezoid is () cm2
The length of the upper sole is 6cm, and the length of the lower sole is 10cm after 4cm extension
Let the height of trapezoid be H
Then 1 / 2 * h * 4 = 10
H=5
The area of trapezoid is 1 / 2 * 5 * (10 + 6) = 40
91.56 / 0.7 / 0.6 = how to calculate
91.56/0.7/0.6=91.56÷7/10÷6/10=91.56×10/7×10/6=9156÷42=218
There are 48 birds on the three trees in the forest. If 8 birds fly away from the first tree and fall on the second tree; if 6 birds fly away from the second tree and fall on the third tree, the number of birds on the three trees is equal. Q: how many birds fall on each tree?
The number of birds on the last three trees: 48 △ 3 = 16; the number of birds on the third tree: 16-6 = 10; the number of birds on the second tree: 16-8 + 6 = 14; the number of birds on the first tree: 16 + 8 = 24; a: the number of birds on the first tree: 24; the number of birds on the second tree: 14; the number of birds on the third tree: 10
It is known that: in the parallelogram ABCD, point E is the midpoint of ab. if AF = 2fd is intercepted on the straight line AD and EF intersects AC with G, then agac = 0___ ．
(1) When point F is on line ad, let the extension line of EF and CD intersect h, ∵ ab ∥ CD, ∵ EAF ∵ HDF, ∵ HD: AE = DF: AF = 1:2, that is, HD = 12ae, ∵ ab ∥ CD, ∵ CHG ∽ AEG, ∵ Ag: CG = AE: ch ∵ AB = CD = 2ae, ∵ ch = CD + DH = 2ae + 12ae = 52ae, ∵ Ag: CG = 2:5
How many times the mass of the sun is that of the earth
At present, the mass of the sun is 332800 times that of the earth, but in the long process of celestial evolution, the mass of the sun will decrease
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