(- 5 1 / 3) times (+ 1 7 / 8) times (- 2 1 / 5) Multiplication of rational numbers,

(- 5 1 / 3) times (+ 1 7 / 8) times (- 2 1 / 5) Multiplication of rational numbers,

(- 5 1 / 3) times (+ 1 7 / 8) times (- 2 1 / 5)
=16/3x15/8x11/5
=10x11/5
=22
If you don't understand this question, you can ask,

The least common multiple of a number is 42. This number is? Decompose it into prime factor?

The number is 42
If you decompose it, the prime factor is 42 = 2x3x7

Given a = 5x-8, B = 10x + 6, when x takes what value, A-B = 2x? Fast!

a-b=5x-8-(10x+6)=2x
-5x-14=2x
7x=-14
x=-2

Find the rule, 2x, - 5x ^ 2, 10x ^ 3 - 17x ^ 4, what is the eighth number

2 = 1 * 1 + 1; 5 = 2 * 2 + 1; 10 = 3 * 3 + 1; and so on, the odd item is positive, the even item is negative, and the degree of X is item number, so the answer is - 65x ^ 8

One third = 0.33 cycle, then three thirds =?

Three thirds = one
no problem!

Is the reciprocal of 0.3 a zero three three cycle? And explain why

I told you. 0.3 = three tenths
This problem is equivalent to finding the reciprocal of three tenths
The reciprocal of three tenths is ten thirds
So it should be 3.33333
：）

What is the 5.33 cycle equal to?

16 / 3

What's three and a half times (minus two and a quarter) times (minus three and a half)

847 out of 24

Three thirds [2 (x minus one half) plus two thirds] equals 2x

3/2[2(x-1/2)+2/3]=2x
3(x-1/2)+1=2x
3x-3/2+1=2x
3x-2x=1/2
x=1/2

0.9+0.99+0.999+.+0.999999999=?

（1-0.1）+（1-0.01）+（1-0.001）+.+（1-0.000000001）=9-0.111111111=8.888888889