Question

若x的3M次方=4,Y的3n次方=5,求（x的2m次方）+（y的n次方）3—x的2m次方×y的n方的积等于多少?

Answer 1

x^(3m)=4,则x^m=4^(1/3),

y^(3n)=5,则y^n=5^(1/3),

∴原式=4^（2/3）+5-4^(2/3)*5^(1/3)

=16^(1/3)+5-80^(1/3)

≈3.21.