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When x →∞, the limit of X * sin (1 / x) =? Please write down the process
one
Let t = 1 / X when x →∞ equals that t tends to 0
So the limit of X * sin (1 / x) = sin (T) / T = 1
Can 15.7-6.2 + 4.3-3.8 be simplified?
15.7-6.2+4.3-3.8
=(15.7＋4.3)－(6.2+3.8)
=20－10
=10
On the X equation, one root of x square plus four x minus m equals zero is the root sign, five minus two, then M equals the other root of the equation
Negative root five minus two
How to calculate 3600 △ 72 + 18 × 45 simply?
=3600÷6÷12+18×5×9
=600÷12+90×9
=50+810
=860
Actually, I do it by mouth
Let a and B be the points on the hyperbola x ^ 2 + y ^ 2 / 2 = 1, and the AB equation is y = x + 1. If the bisector of the line AB and the hyperbola intersect at two points CD, then is ABCD co circular and why
A (- 1,0), B (3,4) are obtained by taking AB equation into hyperbolic equation. The M coordinate of AB midpoint is (1,2), and the CD equation of AB vertical bisector is y = - (x-1) + 2 = - x + 3. C (- 3 + 2 √ 5,6-2 √ 5), D (- 3-2 √ 5,6 + 2 √ 5) are obtained by taking AB equation into hyperbolic equation. The N coordinate of CD midpoint is (- 3,6). The distance formula between two points is calculated as | Na | = 2 √ 10, | Nb | = 2 √ 10, | NC | = | nd | = 2 √ 10
The equation a.3x-5 = x + 1 B.3 (X-7) = - 9 C. the negative half of x equals 2
Choose B Ask your parents this kind of questions in the future
The abscissa of the point of intersection of the graph of a function y = 5x + 3 and the X axis is the solution of the following equation 1.5x + 3 = 12.5x-3 = 0.3.2x + 1 = - 3x-2
4.3x+5=0
Let y = 5x + 3 = 0
If 3.2X + 1 = - 3x-2 is combined with similar terms, 5x + 3 = 0 will be obtained
So choose three
How to calculate 29.5 * 3.8 + 2.95 * 52 + 295 * 1 / 10
29.5×3.8＋2.95×52＋295×1/10
＝29.5×3.8＋29.5×5.2＋29.5×1
＝29.5×（3.8＋5.2＋1）
＝29.5×10
＝295
If the equation of a straight line is x + 4y-1 = 0, then K=____
x+4y-1=0
y=(1-x)/4
y=0.25-0.25x
So k = - 0.25
21 to 25 English words
21,22,23,24,25 English words
twenty-one
twenty-two
twenty-three
twenty-four
twenty-five
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