What is the factorization quality factor

What is the factorization quality factor

Decompose 42, the prime factor is 42 = 2 × 3 × 7 × 1______ ．

Decompose 42 into prime factor: 42 = 2 × 3 × 7, because 1 is neither prime nor composite, so the original question is wrong

① The least common multiple of 42 and 72 is obtained by decomposing the prime factor
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42:2 times 3 times 7
72:2 times 2 times 2 times 3 times 3
[42,72]: 2 times 2 times 2 times 3 times 3 times 7 = 504

A simple method is used to calculate: 0.9 + 0.99 + +0.999999999．

0.9+0.99+… +0.999999999=（1-0.1）+（1-0.01）+… +（1-0.000000001）=9-0.111111111=8.888888889

Simple calculation: 0.9 + 9.9 + 99.9 + 999.9

0.9+9.9+99.9+999.9
=（1-0.1）+（10-0.1）+（100-0.1）+（1000-0.1）
=1+10+100+1000-0.1×4
=1111-0.4
=1110.6

Let a = 0.9 + 0.99 + 0.999 + +0.9999999, find the integer part of A
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＝(1－0.1)+(1-0.01)+.+(1-0.0000000001)=10-0.1111111111
The integer part is 9

Among the three consecutive even numbers, the smallest even number is 2n + 4 (n is an integer), then what is the largest even number?
Such as the title

Two consecutive even numbers differ by 2
The smallest even number is 2n + 4
So the maximum is (2n + 4) + 2 + 2 = 2n + 8

The sum of two consecutive even numbers is 74, and the simplest ratio of the two even numbers is 74______ ．

Let the smaller even number be x, then the other even number is x + 2, then: x + 2 + x = 74, & nbsp; & nbsp; & nbsp; 2x + 2 = 74, & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; X = 36, the other even number is: 36 + 2 = 38, then the ratio of the two numbers is: 36:38 = 18:19 or 38:36

If n is an integer, then even numbers are represented as odd numbers, and three consecutive integers are represented as three consecutive odd numbers?

Even numbers are expressed as 2n
The odd number is expressed as 2n + 1
Three consecutive integers are represented as n-1, N, N + 1
Three consecutive odd numbers are represented as 2N-1, 2n + 1 and 2n + 3
Three continuous even numbers are represented as 2n-2, 2n, 2n + 2

1+2+3+4+5+6+7+8+9+11+12+13.997+998+999=?

=（1+999）+（2+998）····· =1000X（999/2） =499500