From the equation - 3x = 2x + 1, we can get () A. -3x+2x=-1B. -3x-2x=1C. 1=3x+2xD. -2x+3x=1

From the equation - 3x = 2x + 1, we can get () A. -3x+2x=-1B. -3x-2x=1C. 1=3x+2xD. -2x+3x=1

According to the property 1 of the equation, adding - 2x to both sides of the equation gives: - 3x-2x = 1, so B

What is the logarithm of the bottom quarter of log?

A quarter is to the - 2 power of two
Using identities
Equal to - 2

Geography: which hemisphere does 20 degrees south latitude and 10 degrees west longitude belong to?

Southern hemisphere, Eastern Hemisphere
North latitude, northern hemisphere, south latitude, southern hemisphere
The Western longitude less than 20 ° W and the eastern longitude less than 160 ° e belong to the eastern hemisphere; the Western longitude greater than 20 ° W and the eastern longitude greater than 160 ° e belong to the Western Hemisphere;
——Think about the principle of dividing the northern and southern hemispheres and the eastern and western hemispheres

In the known sequence {an}, an = 2n − 1 (n is odd) 3N (n is even), try to find the sum of the first n terms SN of the sequence {an}

(1) When n is odd, n − 12 items are even items, N + 12 items are odd items, (1 point) even items are equal ratio series with B1 = 9 as the first item and q = 32 = 9, so the sum of even items is Sn & nbsp; = 9 (& nbsp; & nbsp; 1 − 9N − 12) 1 − 9 = 98 (3N − 1 − 1) & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp

It is known that the square of the equation x (2m + 1) x + m + 4 = 4m, when x is (1) the equation has two real roots, and (2) the equation has one root x = 0
The equation has a root of - 1

△>=0
4m²+4m+1-4m²+16m-16>=0
20m>=15
m>=3/4
x=0
0+0+m²-4m+4=0
(m-2)²=0
m=2
x=-1
1-2m-1+m²-4m+4=0
m²-6m+4=0
m=3±√5

2 hours 18 minutes=______ 3 cubic meters per hour, 20 cubic decimeters per hour=______ Cubic meter=______ Cubic decimeter

(1) 18 △ 60 + 2 = 2.3 (hours), so 2 hours 18 minutes = 2.3 hours; (2) 20 △ 1000 + 3 = 3.02 (cubic meters), 3 × 1000 + 20 = 3020 (cubic decimeters), so 3 cubic meters 20 cubic decimeters = 3.02 cubic meters = 3020 cubic decimeters; so the answer is: 2.3, 3.023020

Calculation: 0.1 + 0.2 + 0.3 + +0.8+0.9+0.10+0.11+0.12+… +0.98+0.99+1.00=______ ．

0.1+0.2+0.3+… +0.8+0.9+0.10+0.11+0.12+… +0.98+0.99+1.00，=（0.1+0.2+0.3+… +0.8+0.9）+（0.10+0.11+0.12+… +0.98 + 0.99 + 1.00), = (0.1 + 0.9) × 9 △ 2 + (0.10 + 1.00) × 91 △ 2, = 4.5 + 50.05, = 54.55; so the answer is: 54.55

Find the range of y = a ^ (x ^ 2-3x-5) [a > 0 and a is not equal to 1] of the function
X ^ 2-3x-5 is the exponent of a

The minimum value of x ^ 2-3x-5 is - 29 / 4
When a ∈ (0,1), then its range is (0, a ^ (- 29 / 4))
When a ∈ (1, + ∞), its range is (a ^ (- 29 / 4), + ∞)

Draw a round lawn on a 1:400 scale plan with a radius of 3cm. The actual area of the round lawn is () square meters

Actual radius = 3 × 400 = 1200 (CM) = 12 (m)
Actual area = 3.14 × 12 & # 178; = 452.16 (M2)
Draw a round lawn on a 1:400 scale plan with a radius of 3cm. The actual area of the round lawn is (452.16) square meters

How much is 22:30 minus 09:00?

13:30