Question

已知x+y=3,x²-y²=15,求2x²乘y的2013次方

Answer 1

x-y=(x²-y²)÷(x+y)=15÷3=5;

2x=8;

x=4;

y=3-4=-1;

∴2x²乘y的2013次方

=2×4²×(-1)

=-32;

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