If two non-zero rational numbers are opposite to each other, their reciprocal is also opposite to each other Such as the title

If two non-zero rational numbers are opposite to each other, their reciprocal is also opposite to each other Such as the title

This is right
a=-b
1/a=-1/b

How much is 2 times 1 in 4 plus 4 times 1 in 6 plus 6 times 1 in 8 plus ellipsis plus 1 in 2010 in 2008

1/2*4+1/4*6+1/6*8+...+1/2008*2010=1/2*(1/2-1/4)+1/2*(1/4-1/6)+1/2*(1/6-1/8)+...+1/2*(1/2008-1/2010)=1/2*(1/2-1/4+1/4-1/6+1/6-1/8+...+1/2008-1/2010)=1/2*(1/2-1/2010)=1/2*(1005/2010-1/2010)=1/2*1004/201...

3x ^ 2-8x + 2x ^ 2-13x ^ 2 + 2x-2x ^ 3 + 3, where x = - 3 / 2

3x^2-8x+2x^2-13x^2+2x-2x^3+3
=3x^2+2x^2-13x^2-2x^3-8x+2x+3
=-8x^2-2x^3-6x+3
=-8*(-3/2)^2-2*(-3/2)^3-6*(-3/2)+3
=-8*9/4+2*27/8+9+3
=-18+27/4+12
=-6+27/4
=-6+6+3/4
=3/4

√72-√54+√96-√108=?｛√45+√18｝-｛√8-√125｝=?2/1｛√2+√3-｝-4/3｛√2+√27｝=?

√72-√54+√96-√108=6√2-3√6+4√6-6√3=6√2+√6-6√3
｛√45+√18｝-｛√8-√125｝=｛3√5+3√2｝-｛2√2-5√5｝
=3√5+3√2-2√2+5√5=8√5+√2
The title should be 1 / 2 {2 + 3 -} - 4 / 3 {2 + 27}=
1/2｛√2+√3-｝-4/3｛√2+3√3｝
=1/2√2-4/3√2 + 1/2√3-4√3
=-5/6√2 -7/2√3

Given that the graph of a function of degree passes through point a (2, - 1) and point B, where point B is the intersection of another straight line y = - 1 / 2x + 3 and X axis, the expression of the function of degree is obtained

X-axis then y = 0
y=-1/2x+3
x=6
So B is (6,0)
A(2,-1)
Let y = KX + B
Then 0 = 6K + B
-1=2k+b
subtract
4k=1
k=1/4
b=-6k=-3/2
So y = x / 4-3 / 2

Add five to a number, multiply by two, subtract four, divide by two, subtract the original number, then you can get the original number. What's the number?

【(x+5)×2-4】÷2-x=x
2x+10-4=4x
2x=6
x=3

Given the function f (x) = loga | logax | (a > 0 and a ≠ 1), if f (x) ∈ (1, positive infinity), find the range of X

① When 0 < a < 1, | logax | a,
﹣a﹤logax﹤a,a^a﹤x﹤a^(﹣a)
②a﹥1 |logax|﹥a
Logax ＜ - A or logax ＞ a
X ＜ a ^ (- a) or X ＞ a ^ A

Seventy seven out of nine minus 21 out of eight minus 1.375
I will hand in my homework soon

77/9-21/8-1.375
=77/9-(21/8+11/8)
=77/9-4
=41/9

In the solution of the system of equations {x + 7Y = m + 1,2x-y = 4, if the sum of x.y is equal to 1, then M = how much, I will give a detailed solution process

y=2x-4
x+y=1
x+2x-4=1
3x=5
x=5/3
y=-2/3
5/3-14/3=m+1
-3=m+1
m=-4

-What is 3.5 radians equal to

=-3.5 △ π × 180 = - 630 / π degree