问题
解答题
化简求值:2xy-
|
答案
原式=(2xy-
xy-1 3
xy)+(-5 3
x2y3+3 2
x2y3)-11 2
=-x2y3-1;
当x=-2,y=3时,原式=-(-2)2×33-1=-109.
化简求值:2xy-
|
原式=(2xy-
xy-1 3
xy)+(-5 3
x2y3+3 2
x2y3)-11 2
=-x2y3-1;
当x=-2,y=3时,原式=-(-2)2×33-1=-109.