(-2a^2b)^2*3ab^3/(-6a^3b)

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(-2a^2b)^2*3ab^3/(-6a^3b)
(-2a^2b)^2*3ab^3/(-6a^3b)

(-2a^2b)^2*3ab^3/(-6a^3b)
=-8a^4b^2 ×3ab^3/(-6a^3b)
=4a^2b^4