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23. 2/3x^2y^2
24. 73
Step-by-step explanation:
23. 2/3xy(x^2-xy^2)
=2/3xy(xy)
=2/3x^2y^2
24. a+b=9 ab=4
a^2+b^2=(a+b)^2-2ab
=(9)^2-2×4
=81-8
=72
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