Calculating X / X-2 + X + 1 / 2-x by fractional addition and subtraction

Calculating X / X-2 + X + 1 / 2-x by fractional addition and subtraction

Original formula = x / X-2 - x + 1 / X-2
=x-x-1/x-2
=-1/x-2
=-1/-（2-x）
=1/2-x
If you can't understand it, you can also divide it into several parts

A (- 2,4) B (1, m) a * b = - 10 how much is m equal to

a(-2,4)b(1,m)
a*b=-2+4m=-10
m=-2

If (4 * 10 ^ m) *

（4*10^m）*（20*10^3）*(5*10^2)=4*10^9
4*20*5*10^(m+3+2)=4*10^9
4*100*10^(m+5)=4*10^9
4*10^(2+m+5)=4*10^9
m+7=9
m=2

Can we deduce M = - 4 or m equals - 3 when m equals - 4?

Yes
M = - 4 is true and M = - 3 is false
True or false is true

6 times PA of 4.56 × 10 is approximately equal to the standard atmospheric pressure?

1 standard atmospheric pressure = 760 mmHg = 76 CMHG = 1.013 × 10 ^ 5 Pascal
4.56*10^6/1.013*10^5=45

=Mod (- 56,10) why is the result = 4 not equal to 5?

I don't understand you

A few sixths is five tenths, ten twenties is fifty-six

8 out of 16, 28 out of 56

10+56=?

66

1/1x2x3+1/2x3x4+1/3x4x5+1/4x5x6+.+1/48x49x50=
Thank you
emergency

1/1x2x3+1/2x3x4+1/3x4x5+1/4x5x6+.+1/48x49x50=48*51÷(4*49*50)=306/1225

1 / 1x2x3 + 1 / 2x3x4 + 1 / 3x4x5 + 1 / 4x5x6 + 1 / 5x6x7 =? Such questions

6/7