With solution po plss.
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Step-by-step explanation:
goth math mo po
1. 7/2x³ • x²/21
= 1/2x • 1/3
= 1/6x
2. x-2/2 ÷ x-2/5
= x-2/2 × 5/x-2
= 1/2 × 5/1
= 5/2 or 2 1/2
3. 2x-5/4 ÷ x+3/4
= 2x-5/4 × 4/x+3
= 2x-5 × 1/x+3
= 2x-5/x+3
4. x²-9/x²+x-20 • x²-8x+3/3x-9
= (x-3)(x+3)/x²+x-20 • x²-8x+3/3(x-3)
= x+3/x²+x-20 • x²-8x+3/3
= x³-8x²+3x+3x²-24x+9/3x²+3x-60
= x³-5x²-21x+9/3x²+3x-60
5. x²+6x+9/x²+3x+2 • x+3/x-1
= x³+3x²+6x²+18x+9x+27/x³+3x²+2x-x²-3x-2
= x³+8x²+27x+27/x³+x²-x-2