12>( )>11.99 2＞（ ）＞（ ）3 11.99 and 2 are separated

12>( )>11.99 2＞（ ）＞（ ）3 11.99 and 2 are separated

12>( 11.999)>11.99
2＞（ 1.5）＞（1.）3

The range of the function f (x) = (2x-5) / (x-3) (x ∈ a) is (- ∞, 0] ∪ [4, + ∞). How much is a equal to?

3 is obtained from (2x-5) / (x-3) > = 4

Draw a round lawn on a plan with a scale of 1:2000 and a radius of 3cm. How many meters is the actual radius of the round lawn?

Actual distance = distance on the map △ scale = 3 △ 1 / 2000 = 3 × 2000 = 6000 cm = 60 m. A: the actual radius of this round lawn is 60 M

120 divided by 42 equals 42 minus 22

42-22=20
120÷20=6

Use the definition of derivative to find the derivative of the following function:
f(X)=X^3

F "(x) = LIM (t tends to 0) [f (x + T) - f (x)] / T = LIM (t tends to 0) [(x + T) ^ 3-x ^ 3] / T = LIM (t tends to 0) [(x + t-x) ((x + T) ^ 2 + X (x + T) + x ^ 2] / T = LIM (t tends to 0) [(x + T) ^ 2 + X (x + T) + x ^ 2] = 3x ^ 2]

Calculation: 200.8 × 73-6.3 × 2008 & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; 9999 × 2222 + 3333 × 3334 (1 + 12) × (1-12) × (1 + 13) × (1-13) × （1+199）×（1-199）

①200.8×73-6.3×2008 =2008×7.3-6.3×2008=2008×（7.3-6.3）=2008×1=2008；       ②9999×2222+3333×3334=3333×6666+3333×3334=3333×（6666+3334）=3333×10000=...

The difference between four fifths and a number is 64% of 8 / 7

4/5-8/7*64%
=140*4/700-8*64/700
=(560-512)/700
=48/700
=24/350

3 / (x-1) (X-2), 4 / (2-x) (5-x), 5 / (x-3) general

(2-x)(5-x)=(x-2)(x-5)
So the simplest common denominator is (x-1) (X-2) (x-3) (X-5)
therefore
3/(x-1)(x-2)=3(x-3)(x-5)/(x-1)(x-2)(x-3)(x-5)
4/(2-x)(5-x)=4(x-1)(x-3)/(x-1)(x-2)(x-3)(x-5)
5/(x-3)=5(x-1)(x-2)(x-5)/(x-1)(x-2)(x-3)(x-5)

1 x 2 / 1 x 3 / 1 x 4 / 1 1 out of 10 98x99 and 1 out of 10 99x100 = ()

1 - 1/2+1/2 - 1/3+1/3 - 1/4+1/4 - 1/5+…… +1/98 - 1/99+1/99 - 1/100=1 - 1/100=99/100

If the square of the root of a is one, then A. negative B. positive C. 0 D. rational number should be taken

B a must be a non negative number under the root sign. A cannot be zero as the denominator, so it is a positive number