1) y⁴(y²)²= y⁴y⁴=y⁸.
2) 5x²y-8x²y+x²y= -2x²y.
3) (2ab²)⁴×(2a²b)³= 2⁴a⁴b⁸×2³a⁶b³= 2⁷a¹⁰b¹¹= 128a¹⁰b¹¹.
1) y⁴(y²)²= y⁴y⁴=y⁸.
2) 5x²y-8x²y+x²y= -2x²y.
3) (2ab²)⁴×(2a²b)³= 2⁴a⁴b⁸×2³a⁶b³= 2⁷a¹⁰b¹¹= 128a¹⁰b¹¹.