If the square of the parabola y = MX - 3x + 3M + m passes through the origin, then the maximum value of M is []

If the square of the parabola y = MX - 3x + 3M + m passes through the origin, then the maximum value of M is []

The square of y = MX - 3x + 3M + m over (0,0)
So there are:
M is not equal to 0 (the function is a parabola ~), and:
0 = 3M + m ^ 2 (substitute x = 0, y = 0)
So m = - 3
The maximum value of M is [- 3]

Solve the problem by equation and arithmetic
Zhu Bajie said, "my weight is 216 kg." Sun Wukong said, "the weight of Zhu Bajie is 4 times that of me, 36 kg less." Q: how many kg is Sun Wukong?
Use equation and arithmetic to solve the problem
It's coming!

Equation:
Set the monkey king x kg
4x-36=216
4x=252
x=63
A: the monkey king is 63kg
Arithmetic:
(216 + 36) △ 4 = 63kg
A: the monkey king is 63kg

In the experiment of "depicting volt ampere characteristic curve of small bulb", the reason of using ammeter external connection method is that
In the experiment of "depicting volt ampere characteristic curve of small bulb", the reason of using ammeter external connection method is ()
A. The resistance of a small bulb is much less than that of an ammeter
B. The resistance of a small bulb is much less than that of a voltmeter
C. The resistance of a small bulb is much greater than that of an ammeter
D. The resistance of a small bulb is much greater than that of a voltmeter

When the ratio of internal resistance of voltmeter and small bulb is greater than that of small bulb and ammeter, external connection of ammeter is adopted
On the contrary, it is internal
The answer is a, B

2xy-xz
6x^2+9x
4x^2-9
x^2-4x+4
x^2-16y^2
9x^2-6x+1
2x^2y-8xy+8y

①2xy-xz=x(2y-z)②6x^2+9x=x(6x+9)=3x(2x+3)③4x^2-9=(2x+3)(2x-3)④x^2-4x+4=(x-2)(x-2)⑤x^2-16y^2=(x+4y)(x-4y)⑥9x^2-6x+1=(3x-1)(3x-1)⑦2x^2y-8xy+8y=y(2x^2-8x+8)=2y(x^2-4x+4)2y(x+2)(x-2)

In June 2012, Uncle Li deposited 50000 yuan into a bank for two years. According to the annual interest rate of 4.40%, how much interest does Uncle Li get after maturity?

50000 × 2 × 4.4% = 4400 yuan
A: Uncle Li gets 4400 yuan of interest after maturity
Dad bought an mp4, the original price is 450 yuan, now give 15% discount, how much is the current price? 450 * 0.85 = 382.5 (yuan)
Team

What does * mean in the math problem
X*（1+0.8%）+（42-X）*（1+1.1%）=42*（1+1%）
I don't understand

Multiply sign!
Most of the multiplication signs in the computer are this * and only some professional processing is our mathematical ×
Or special buttons!
With intelligent ABC input method, press V key and 1 key at the same time, that is, press V + 1 at the same time, and the symbol will come out if you press more times

Excuse me, today is Tuesday. What day is it in 102 days?
How to calculate the answer,

102÷7＝14…… four
Therefore, the number of weeks after 102 days is the same as that after 4 days, which is Saturday

Mathematics problems in grade two of junior high school (frequency and opportunity)
There are five white and five yellow balls in a sealed box
Q: 1) a chance to get five white balls at a time;
2) A chance to get four white balls at a time;
3) A chance to get three white balls at a time;
4) The experiment was simulated by substitution method
Requirements: detailed

1) 1 / 252, i.e. c10,5 = 252
2) 1 / 42, which is c5,4 / c10,4 = 5 / 210 = 1 / 42
3) 1 / 12, using permutation combination, namely c5,3 / c10,3 = 10 / 120 = 1 / 12
4)

12 × 231 = 132 × 21. Such an equation is called a pair equation. Write the equation on the left side of the equal sign from right to left to get the equation on the right side of the equal sign
Here is another symmetrical equation, but one of the numbers is not written out and is replaced by a bracket:
12×46（）=（）64×21
What is the number of () in the formula? Can you work it out with the equation?

（460+x）12=（100x+64）21
x=2

After a problem in the book is simplified, we get x ^ 2-5x + 6 = 0, that is, (X-2) (x-3) = 0. The problem is how to think of (X-2) (x-3) = 0 as soon as you see x ^ 2-5x + 6 = 0, and how to calculate it. You say you can get x ^ 2-5x + 6 = 0 as soon as you see (X-2) (x-3) = 0. It's understandable, but conversely, how to calculate it

X^2-5x+6=0
x²-3x-2x+6=0
x(x-3)-2(x-3)=0
(x-2)(x-3)=0
Simple algorithm
cross multiplication
1 -2
×
1 -3
First, find out the factors of the quadratic term and the constant term, and then multiply them by the cross to get the coefficient equal to the first term