问题
解答题
已知x3m=4,y3n=5,求:(x2m)3+(yn)3-x2myn•x4m•y2n的值.
答案
(x2m)3+(yn)3-x2myn•x4m•y2n=(x3m)2+y3n-(x3m)2•y3n,
∵x3m=4,y3n=5,
∴原式=42+5-42×5
=-59.
已知x3m=4,y3n=5,求:(x2m)3+(yn)3-x2myn•x4m•y2n的值.
(x2m)3+(yn)3-x2myn•x4m•y2n=(x3m)2+y3n-(x3m)2•y3n,
∵x3m=4,y3n=5,
∴原式=42+5-42×5
=-59.