tolong ya pls pakai cara

1.2x/5 + x/5
=2x + x/5
=3x/5
2.4/a - 2/a²
=4(a)/a(a) - 2/a²
=4a-2/a²
3.a/b - c
=a/b - c/1
=a(1)/b(1) - c(b)/1(b)
=a-bc/b
4.x/2 + x-4/3
=x(3)/2(3) + x-4(2)/3(2)
=3x+2x-8/6
=5x-8/6
5.3x-2/6 - x+4/3
=3x-2/6 - x+4(2)/3(2)
=3x-2-2x+8/6
=x+6/6
6.5/a-1 - 5/a
=5(a)/a-1(a) - 5(a-1)/a(a-1)
=5a-5a+5/a²-a
=5/a²-a
7.5/x+y + 2/x-y
=5(x-y)/(x+y)(x-y) + 2(x+y)/(x+y)(x-y)
=5x-5y+2x+2y/(x+y)(x-y)
=7x-3y/(x+y)(x-y)
=7x-3y/x²-y²
8.a/a+b + b/a-b
=a(a-b)/(a+b)(a-b) + b(a+b)/(a+b)(a-b)
=a²-ab+ab+b²/(a+b)(a-b)
=a²+b²/(a+b)(a-b)
=(a+b)(a+b)/(a+b)(a-b)
=a+b/a-b
9.3/a²-1 - 2/a+1
=3/(a+1)(a-1) - 2(a+1)/(a+1)(a-1)
=3-2a-1/(a+1)(a-1)
=-2a-2/(a+1)(a-1)
=-2a-2/a²-1
10.3/x²-6x+9 - 2/x²-9
=3/(x-3)(x-3) - 2/(x+3)(x-3)
=3(x+3)/(x+3)(x-3)(x-3) - 2(x-3)/(x+3)(x-3)(x-3)
=3x+9-2x+6/(x+3)(x-3)(x-3)
=x+15/(x²-9)(x-3)
=x+15/x³-3x²-9x+27