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Answer :
(i)Given:\(28x^4 ÷ 56x\)
\(=\frac{28\times x \times x \times x \times x}{28\times 2 \times x}\)
\(=\frac{x \times x \times x}2=\frac{x^3}2\)
(ii)Given:\(-36y^3 ÷ 9y^2\)
\(=\frac{-1\times 4 \times 9 \times y \times y \times y}{9\times y \times y}\)
\(=\frac{-1 \times 4 \times y}1=-4y\)
(iii)Given: \(66pq^2r^3 ÷ 11qr^2\)
\(=\frac{6\times 11 \times p \times q \times q \times r \times r \times r}{11\times q \times r \times r}\)
\(=\frac{6 \times p \times q \times r}1=6pqr\)
(iv)Given: \(34x^3y^3z^3 ÷ 51xy^2z^3\)
\(=\frac{6\times 11 \times x \times x \times x \times y \times y \times y \times z \times z \times z}{17\times 3 \times x \times y\times z \times z \times z}\)
\(=\frac{2 \times x \times x \times y}3=\frac{2x^2y}{3}\)
(v)Given:\(12a^8b^8 ÷ (-6a^6b^4)\)
\(=\frac{6\times 2 \times a \times a \times a \times a \times a \times a \times a \times a \times b \times b \times b \times b \times b \times b \times b \times b }{-1\times 6\times a \times a \times a \times a \times a \times a \times b \times b \times b \times b}\)
\(=\frac{2 \times a \times a \times b \times b \times b \times b}{-1}=-2a^2b^4\)