xponentiation is a mathematical operation, written an, involving two numbers, the ba a and the exponent n. When n is a positive integer, exponentiation corresponds to repeated multiplication:
a2 = a·a is called the square of 莎士比亚名言a becau the area of a square with side-length a is a2.
a3 = a·a·a is called the cube, becau the volume of a cube with side-length a is a3.
So 32 is pronounced "three squared",and 23 is "two cubed".
因此，102 应该读作 "ten squared", 103应该读作 "ten cubed".
The exponent says how many copies of the ba are multiplied together. For example, 35五大战役 = 3·3·3·3·3 = 243. The ba 3 appears 5 times in the repeated multiplication, becau the exponent is 5. Here, 3 is the ba, 5 is the exponent, and 243 is the power or, more specifically, the fifth power of 3 or 3 raid to the fifth power别君去兮何时还.
The word "raid" is usually omitted, and most often "power" as well, so 35 is typically pronounced "three to the fifth" or "three to the five".
所以，105的发音应该是 ten to the fifth 或 ten to the five.
Exponentiation with ba 10 is ud in scientific notation to describe large or small numbers. For instance, 299,792,458 (the speed of light in a vacuum, in meters per con
d) can be written as 2.99792458·108 and then approximated as 2.998·108, (or sometimes as 299.8·106, or 299.8E+6, especially in computer software).
一直不知道英语里科学计数法该怎么读，网上看了一个权威帖子，决定转载。
原帖地址：openlearn.open.ac.uk/mod/resource/view.php?id=116743
Scientific notation
To express a number in scientific notation the first stage is to divide it successively by 10 until it is reduced to a number that is less than 10. For example, to express the number 4865 in scientific notation I would divide it successively by 10 until I arrived at 4.865. Usually this will result in a number that includes a decimal fraction (the number that follows the decimal point) as well as a whole number part. In my example, 4 is the whole number part and .865 the decimal fraction.
The next stage is to give some indication of how many times the number would have to be multiplied by 10 in order to return it to its original value. In my example I made three successive divisions by 10, so I would have to multiply by 10 three times – that is 10×10×实施10 – to return to the original value. So my number could be expresd as 4.865×10×10×10, but this is hardly a shorthand alternative. So instead of writing 10×10×10, I can express this as 103. The first figure (10 in this ca) is known as the ba and the cond figure (3 in this ca) is known as the 海市蜃楼歌词power or exponent二年级下册数学期末试卷 (or sometimes the index). The example would be read as ‘ten to the power of three’.
The final stage in scientific notation is to join together the results from the two earlier stages using a multiplication sign giving, in my example, 4.865×103.
Any number can be expresd in scientific notation. For example:
This is an equation, which reads five thousand equals five times ten, times ten, times ten
equals five times ten to the power of 3.鹰嘴豆怎么吃
This is an equation, which reads venty-two thousand equals ven point two times ten, times ten, times ten, times ten equals ven point 2 times ten to the power of four.
This is an equation, which reads eighty-two thousand, six hundred equals eight point two six times 10, times ten, times ten, times ten equals eight point two six times ten to the power of four.
衰草连天的拼音
Fortunately, there is a quicker way of doing the conversions than by writing out all of the multiplication stages. I'll u the number 7 390 000 to demonstrate the method. Start by imagining there is a decimal point at the right hand end of the number. (I'll add a final 0 so that the decimal point can be en clearly. This extra 0 is redundant since it doesn't alter the original value at all.)
Now move the decimal point one place at a time until it sits after the left-most number, and count the number of places the decimal point has been moved:
This image shows the figure ven point three nine zero, then three more zeros, then one more zero. Curved lines with arrows above the figures, from right to left, show how the decimal point has moved 6 places to the left.
(decimal point moved 6 places to the left)
Now remove all the Os at the right-hand end after the decimal point (becau the are redundant) and multiply what is left by 10 raid to the power of the number of places the decimal point has been moved.
This image shows the equation ven point three nine times 10 to the power of six.
You will often e a number expresd just as the ba and the power – for example 106 and 102. This is interpreted as 1×106(=1 000 000) and 1×102 (=100).
