Sederhanakan aljabar berikut jika diketahui x = 2a2b-5ab y = -3a2b+ab Hitunglah: a. 3x-y b. -x+2y c. -2x-y

a)
3x-y
= 3(2a²b-5ab)-(-3a²b+ab)
= 6a²b+15ab+3a²b-ab
= 9a²b+14ab

b)
-x+2y
= -(2a²b-5ab)+2(-3a²b+ab)
= -2a²b+5ab-6a²b+2ab
= -8a²b+7ab

c)
-2x-y
= -(2a²b-5ab)-(-3a²b+ab)
= -2a²b+5ab+3a²b-ab
= a²b+4ab