Question

x,y是负倒数.x*(y的三次方)等于多少.

Answer 1

∵ 互为相反数的和为0,互为负倒数的积为-1

∴ a+b=0,xy=-1

∴ 原式=(1/3)×c²×(a+b)²-(4/3)c²×(xy)³

=(1/3)×3²×0²-(4/3)×3²×(-1)³

=0-(4/3)×9×(-1)

=0+12

=12