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Find the inequality about 2 * x square + kx-k less than or equal to 0
1) When △ = k ^ 2 + 8K
There are two barrels of oil. The weight of the first barrel is 1.5 times that of the second barrel. If 1kg of oil is taken out of the first barrel and put into the second barrel, the weight of the two barrels is equal. How many kg of oil is there in the two barrels? (the weight of the barrel is ignored)
There are two barrels of oil. The weight of the first barrel is 1.5 times that of the second barrel. If 1kg of oil is taken out of the first barrel and put into the second barrel, then the weight of the two barrels is equal. How many kg of oil is there in the two barrels? (the weight of the barrel is ignored) use the equation to solve the steps
According to the question, the answers are as follows: from the topic point of view, "equal weight" is an equivalent relationship
Let the second barrel be XKG, then the first barrel be 1.5x, then the equation can be listed
1.5X-1=X+1
1.5X-X=1+1
0.5x=2
x=4
Then: the first barrel is 4x1.5 = 6kg; the second barrel is 4kg
A: of the two barrels, the first one was 6 kg and the second one was 4 kg
Check calculation: if 1.5x4-1 = 4 + 1 = 5, the answer is correct
The first derivative of a constant exists, but why doesn't the second derivative of F (x) = x exist?
Of course, the second derivative of F (x) = x exists!
f"(x)=0
If a number is 3 times larger than itself by 12.6, what is the number? Suppose that the number is x, the equation is (), and the solution of the equation is ()
How much is it
Suppose the number is x, the equation is (3x = x + 12.6), and the solution of the equation is (6.3). Suppose the number is x, then: & nbsp; & nbsp; & nbsp; 3x = x + 12.6 & nbsp; & nbsp; & nbsp; & nbsp; 2x = 12.6 & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; the solution is
The inner diameter of the main pipe of the water supply pipe of a waterworks is 8 decimeters, and the water flow velocity is 1.2 meters per second. How many cubic meters of water can this pipe transport in one minute?
Hello, experts
Bottom area of main pipe of water supply pipe:
(8 / 2) & sup2; × 3.14 = 50.24 (square decimeter) = 0.5024 (square meter)
This kind of water pipe can transport in one minute:
0.5024 × 1.2 × 60 = 36.1728 (M3)
Answer: this kind of water pipe can transport 36.1728 cubic meters in one minute
(x + 1) / (x ^ 2-4), when x → 2 is infinitesimal, sea lion is infinite?
It's obviously infinitesimal to bring it in directly, but I thought of the l-hocapital rule. LIM (x → 2) gets 1 / (2x) from the upper and lower derivatives of fractions, and then brings x → 2 in is equal to 1 / 4. What's wrong with my thinking? If you are the one!
This topic is C / 0 type, can not use the law of lobita, the limit is ∞
One by two times one by three plus one by three times one by four. One by eight times one by nine. It is easy to calculate
1/2*1/3+1/3*1/4+1/4*1/5+1/5*1/6+1/6*1/7+1/7*1/8+1/8*1/9
=1/3(1/2+1/4)+1/5(1/4+1/6)+1/7(1/6+1/8)+1/8*1/9
=1/4+1/12+1/24+1/72
=1/4(1+1/3)+1/24(1+1/3)
=1/3+1/3*1/6=1/3*(1+1/6)=7/18
1,1,7,17,31,71
According to the rule of given numbers, what should be filled in the question mark? Please give a detailed explanation
A 32 B 36 C 49 D 64
c 49
Before and after the difference is 2 6 10... Is the arithmetic sequence, the difference is 4
The difference was 26 10 14 18 22
The corresponding number is - 1 1 7 17 31 49 71
There are three forces in common, which are 14N, 10N and 5N respectively. What is the minimum resultant force,
Because three forces can form a vector triangle (satisfying the triangle relationship, that is, the sum of two sides is greater than the third side, and the difference between two sides is less than the third side), they can cancel each other, so the minimum is 0
If the sequence an is determined by A1 = 2, an + 1 = an + 2n (n ＞ = 1), try to write the first five terms of the sequence and write a general term formula
a1=2
a2=a1+2=2+2=4
a3=a2+4=4+4=8
a4=a3+6=8+6=14
a5=a4+8=14+8=22
an=n(n-1)+2=n^2-n+2
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