2^15 ×8^10×4^21 =2^15 ×2^30×2^42 =2^87
25^6×125^3 × 125^3 =5^12×5^9 × 5^9=5^30
9^7x 27^3x3^13=3^14x3^9x3^13=3^36
a^5x(a×b)^5× b^5=a^5 xa^5xb^5xb^5=a^10 x b^10
27^8: 81^2×3^21=3^24: 3^8×3^21=3^16x3^21=3^37
36^5×6^5× 6^x
=(2^2×3^2)^5× (2^5×3^5)× (2^x × 3^x) =(2^10×3^10)× (2^5×3^5)× (2^x × 3^x) =2^(15+x) × 3^(15+x)