tolonggg dong di jawab segera sama cara jalannya saya butuh skrg tolongg bngttttt tolong jwb no 4,6,7,8,9,10 tolongg dong jwbn nya buat bsk tolong bngt nanti sy

4).4/49a^2-6/19ab+9/25b^2
6).2(a+5)/3a^2+15a-a-5
2(a+5)/3a*(a+5)-(a+5)
2(a+5)/(3a-1)*(a+5)
=2/3a-1
7).2z-3-(z+2)/(2z-3)*(z+5)
=2z-3-z+2/2z^2+10z-3z-15
=z-5/2z^2+7z-15
8).z^2-9+z^2-4/z^2+3z+2z+6
=2z^2-13/z^2+5z+6
9).2p-4/2p+q
10).5/2(a+b)-4/3(a+b)
=7/6(a+b)
=7/6a+6b
moga membntu jdkn jwbn terbaik ya mksih