There are 10000 bacteria in the organism, and the length of the head and tail is 5mm, so the diameter of the cell is () M

There are 10000 bacteria in the organism, and the length of the head and tail is 5mm, so the diameter of the cell is () M

Divide 5 by 10000 and then divide 1000 to get the - 7th power of 5 * 10

What is the length and width of a 30 inch screen calculated by 16:9?

The so-called 30 inches, refers to the rectangular screen diagonal is 30 inches
Let the length be 16x and the width be 9x
(16x)²＋(9x)²=30²
337x²=900
x=1.634
Length 16x = 26.147 inches, width 9x = 14.708 inches

In a division with remainder, it is known that the sum of divisor, divisor, quotient and remainder is 391, the remainder is 4, the quotient is 11, what is the divisor?

Suppose the divisor is x, then the divisor is 11x + 4. The meaning of the question is: 11x + 4 + X + 11 + 4 = 391, & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; 12x + 19 = 391, & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; 12x = 372, & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp

How to divide 48 out of 60 and 52 out of 91

Divided by 12, it's four fifths
Divided by 13, it's four out of seven

Lunar phase changes in the first half of the month

The numerator of a number is expanded five times, the denominator is unchanged, and the value of the number ()
A. 5 times smaller
B. Five fold expansion
C. Unchanged
D. Not sure

B

A difficult math problem (Grade 6)
There are the same number of black-and-white go pieces in the box. Take out five white pieces and three black pieces each time. After several times of taking, the white pieces are finished, and there are 12 black pieces left. How many black-and-white pieces are there in the box

Because the number of black and white chessmen is the same, and because each time the white chessmen took 2 more than the black chessmen, and finally left 12 black chessmen, obviously a total of 6 times
So there are black and white pieces, a total of 30 + 30 = 60 pieces
No equations are needed

Simple calculation of 3.9 * 2 + 3.9/0.125

3.9*2+3.9/0.125
=3.9*2+3.9/(1/8)
=3.9*2+3.9*8
=3.9*(2+8)
=3.9*10
=39

Quadratic function expression
1. Given that the vertex coordinates of the image of quadratic function are (1, - 3), and pass through the point P (2,0), find the expression of this function

∵ the vertex coordinates of the image of quadratic function are (1, - 3)
Let the expression of this quadratic function be: y = a (x-1) &# 178; - 3 (vertex form)
And then through the point P (2,0)
∴a(2-1)²-3=0
The solution is a = 3
The expression of this quadratic function is: y = 3 (x-1) &# 178; - 3
If it needs to be expanded, it is:
y=3x²-6x

The original price of a dress is 200 yuan, first increased by 10%, then decreased by 10%______ (judge right or wrong)

200 × (1 + 10%) = 200 × 1.1 = 220 (yuan) 220 × (1-10%) = 220 × 0.9 = 198 (yuan) 198 yuan < 200 yuan