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Sequence: 4, 4, 6, 8, 12, 16, 30 what's the next number? Why?
forty-four
The law of the difference between the two is: 0 2 4 4 14, so the next difference should be 14
The - M + 2 power of 3 * the m power of 27
The - M + 2 power of 3 * the m power of 27
=3^(-m+2)*[(3^3)^m]
=3^(-m+2)*3^(3m)
=3^(-m+2+3m)
=3^(2m+2)
That is: 2m + 2 power of 3
-12 - 11 2 6 to be equal to 24
（-12）×（-11）÷ 6 + 2 = 24
Given that a and B are opposite to each other, C and D are reciprocal to each other, and the absolute value of M is 3, find the value of the algebraic formula (a of m plus b) plus c times D plus the quadratic power of M
a. B is opposite to each other, a + B = 0
c. D is reciprocal, CD = 1
The absolute value of M is 3, M = 3, - 3, so M & sup2; = 9
(a of m plus b) plus c times D plus the power of M
=0/m+1+9
=10
Xiao Ming read a story book. On the first day, he read two fifths of it. On the second day, he read four more pages than on the first day. There are still 40 pages left. How many pages are there in this book
80 pages
From the meaning of the title, we can know that after the first day, there are still 4 / 5 books left, 20 + 44 = 64 pages left
So it's 64 / 4 / 5 = 80 pages
If the length of each side of a triangle is the root of the equation x to the second power - 6x + 8 = 0, then what is the perimeter of the triangle?
The length of each side of a triangle is the root of the equation x & sup2; - 6x + 8 = 0
(x-2)(x-4)=0
x1=2 x2=4
So the perimeter is:
2+2+2=6
4+4+4=12
When 2 + 2 + 4, the sum of two sides is equal to the third side
2+4+4=10
So the perimeter is 10 or 6 or 12
It takes two hours for the bus to complete the whole journey, and three hours for the truck to complete the whole journey. When the two cars meet, the bus stops
Walking 30 kilometers, the distance between the two places is () kilometers
The time of two vehicles meeting each other = 1 ÷ (1 / 2 + 1 / 3) = 6 / 5 hours
Bus speed = 30 △ 6 / 5 = 25 km / h
Distance between the two places = 25 × 2 = 50 km / h
Is to compare the size of rational number a and 1 / 2 of a (a is greater than 0)
When a is greater than 0 and less than 1, a is less than 1 / 2 of A
When a equals 1, a equals 1 / 2 of A
When a is greater than 1, a is greater than 1 / 2 of A
When a class goes on an outing to go back to school, the number of people who take the cart is three times that of the car. After six people get off on the way, the number of people who take the cart is four times that of the car. How many people are there in this class
If the number of small cars is x, the number of big cars is 3x
3x-6=4*(x-6)
x=18
There are 72 people in all
X + (one and one-third + one sixth) = 4.5, there must be a process to solve the equation
X + (one and one third + one sixth) = 4.5
x+1.5=4.5
x=4.5-1.5
x=3
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