If the x power of a = n (a > 0, a ≠ 0), then x is called the logarithm of n with a as the base, denoted as X= logaN.log3 9/1=

Iog3 9/1=Iog3 3^2=2

Given the function f (x) = log3mx2 + 8x + NX2 + 1, the domain of definition is r, the range of value is [0,2], and the value of m.n is obtained

Since the domain of F (x) = log3mx2 + 8x + NX2 + 1 is r, ∵ x2 + 1 ＞ 0, MX2 + 8x + n ＞ 0 holds. Let y = MX2 + 8x + NX2 + 1, since the range of function f (x) is [0, 2], then 1 ≤ y ≤ 9, and (y-m) · x2-8x + y-n = 0 holds

Is loga (MN) = logam + Logan true? If not, give an example

No. m, n is negative

The Three Gorges is a very fast river

The river is endless~

When x → 0, the equivalent infinitesimal of the following variables is? A: tan3x B: ln (1 + x) C: sin2x D: x ^ 2

B:ln(1+x)
prove:
lim(x--->0)(ln(x+1) /x
=lim(x--->0)(1/(x+1)
=1

The number of boys in class 61 is 5 / 9 of the total number of the class, and the number of girls is 5 less than that of boys. How many boys and girls are there

Male: 25 female: 20

4 times 8 minus 1.9 in a simple way

3.4*8-1.9
=(3+0.4)*8-1.9
=24+3.2-1.9
=25.3

Find the first n terms and Sn of sequence 1,3 + 5,5 + 6 + 7,7 + 8 + 9 + 10?

The nth term is (2n-1) + 2n + (2n + 1) + +(2n+n-2)=(5n-3)n/2
Sn=5(1²+2²+.+n²)/2-3(1+2+3+.+n)/2=5n(n+1)(2n+1)/12-3n(n+1)/4
So it came out

One factor is 8 and the other is 7. The formula is () read and do（

8 × 7 means eight times seven

Mathematics in grade 2 of junior high school 2 √ 14 * √ 7 = 1 / 3 √ 5 * (- 6 √ 10)=

2√14*√7=2√98=14√2
1/3√5*﹙-6√10﹚= -2√50=-10√2
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If the x power of a = n (a > 0, a ≠ 0), then x is called the logarithm of n with a as the base, denoted as X= logaN.log3 9/1=