问题
解答题
计算: (1)
(2)[x(x2y2-xy)-y(x2-x3y)]÷3x2y. |
答案
(1)
+|-9
|+(-2)3-3
+3
,3 -8
=3+
-8-3
-2,3
=-7.
(2)[x(x2y2-xy)-y(x2-x3y)]÷3x2y,
=(x3y2-x2y-x2y+x3y2)÷3x2y,
=(2x3y2-2x2y)÷3x2y,
=
xy-2 3
.2 3
计算: (1)
(2)[x(x2y2-xy)-y(x2-x3y)]÷3x2y. |
(1)
+|-9
|+(-2)3-3
+3
,3 -8
=3+
-8-3
-2,3
=-7.
(2)[x(x2y2-xy)-y(x2-x3y)]÷3x2y,
=(x3y2-x2y-x2y+x3y2)÷3x2y,
=(2x3y2-2x2y)÷3x2y,
=
xy-2 3
.2 3