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Calculation: 11 × 4 + 14 × 7 + 17 × 10 + +12005×2008．
11×4+14×7+17×10+… +12005×2008=13（1-14）+13（14-17）+13（17-110）+… +13（12005-12008）=13（1-12008）=6692008．
1 × 4 / 1 + 4 × 7 / 1 + 7 × 10 / 1... + 2005 × 2008 / 1
2
Calculation: 11 × 4 + 14 × 7 + 17 × 10 + +12005×2008．
11×4+14×7+17×10+… +12005×2008=13（1-14）+13（14-17）+13（17-110）+… +13（12005-12008）=13（1-12008）=6692008．
|A | = - a what kind of rational number does the letter a take
a≤0
How to simplify the absolute value with letters
There are two ways: 1. Reduce X-5 2, rational numbers a, B, C, a < B < 0 < C, reduce a - B - B + C
1. Simplify X-5
When x > 5, X-5 = X-5
When x = 5, X-5 = 0
When x ＜ 5, X-5 = - (X-5) = 5-x
2, rational numbers a, B, C, a < B < 0 < C, simplify a - B + C
∵a＜b＜0＜c,
∴｜a｜=-a,｜-b｜=-b,｜c｜=c
A - B + C
=-a－(-b)+c
=-a+b+c
Let a and B be rational numbers, and compare the size of (a + B / 2) ^ and ab
The location of rational number a, B and C is shown in the figure, simplifying | a + B | - | B-1 | + | a-c | + | 1-c|
A
1 given a = 10, B = - 5, C = - 8, find the value of the formula | a | - 2 | - B | + half | + C |. 2 the letter a represents a rational number, which one is bigger than - a?
It's a pleasure for you
1. The answer to the first question is 4. Because: | a | - 2 | - B | + half | + C|
=10-2 * 5 + half of 8
=Half of 8
=4
2. There are three cases: when a is less than 0, a is less than - A
When a equals 0: a equals - A
When 2 is greater than 0, a is greater than - A
One word at a time. Let's give it a point,
It is known that a stands for a number. (1) if | a | = a, what number does a stand for? (2) if | a | = - A, what number does a stand for?
(1) If a is a positive number, then a is a negative number
(2) If | a | = - A, what number does a represent? It represents a negative number
There is such a group of numbers: 30, 1 + 30, 2 + 30, 3 + 30, 4 + 30 The nth number is expressed as ()
A. n+30B. （n+1）+30C. （n+2）+30D. （n-1）+30
According to the analysis, the nth number is represented by the formula with letters (n-1) + 30; therefore, D
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