Multiply the first two, divide the last two. 1. frac{18x^3y}{7} cdot frac{14y}{6x^2} 2. frac{x^2+4x+4}{x-9} cdot frac{x^2-81}{x^2+2x} 3. frac{10x^2}{x+3} div 5x 4. frac{x^2+2x-8}{x^2+2x-3} div frac{2x+8}{x+3}
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