Please help me to solve some math problems -99 and 97 / 98 * (- 98) - 5 * (- 11 / 5) + 13 * (- 11 / 5) - 3 * (- 11 / 5)

Please help me to solve some math problems -99 and 97 / 98 * (- 98) - 5 * (- 11 / 5) + 13 * (- 11 / 5) - 3 * (- 11 / 5)

-99 and 97 / 98 * (- 98)
=（-99-97/98)*(-98)
=(99+97/98)*98
=(100-1)*98+97
=100*98-98+97
=9800-1
=9799
-5*（-11/5）+13*（-11/5）-3*（-11/5）
=(-11/5)[(-5)+13-3]
=(-11/5)*5
=-11

A few simple mathematical problems, answer 50 points
(1) One third + one fourth=
One fifth + one sixth=
One tenth + one eleventh=
One fourteenth + one fifteenth=
Half + one fifth=
One sixth + one eleventh=
One third + one fourteenth=
1 / 10 + 1 / 23=
(2) In the above 8 addition formulas, the numerator of the two addends of each addition formula is (), the greatest common factor of the two denominators is (), they are () numbers; the denominator of sum is (), and the numerator is ()
(3) If a and B are coprime numbers, then 1 / A + 1 / b = ()

1、7/12、11/30、21/110、29/210、7/10、17/66、17/42、33/230
2. 1, 1, coprime number, product of denominators of two addends, sum of denominators of two addends
3、(a+b)/a*b

50 points
Seven ninths - (x-one sixth) = one third
13 / 8 x + 15-5 / 8 x = 15.5

7/9-（x-1/6）=1/3 13/8x+15-5/8x=15.5
7/9-x+1/6=1/3 13/8x-5/8x=15.5-15
x=14/18+3/18-6/18 x=0.5
x=11/18

A simple problem of sixth grade
2-3+4-5+6-7+8-9+… +2000-2001+2002=

2-3+4-5+6-7+8-9+… +2000-2001+2002
=2+(-3+4)+(-5+6)+(-7+8)+.+(-2001+2002)
=2+1+1+...+1
=2+1*1000
=1002