题目内容

(1)(6×1010)÷______=-2×105
(2)______•(-
2
5
a2x2)=-5a;
(3)______÷n=a-b+2c;
(4)(3x3y2+x4y2-______)÷
1
2
xy=______+______-1.
(1)(6×1010)÷(-3×105)=-2×105
(2)(
25
2
a-1x-2)•(-
2
5
a2x2)=-5a;
(3)(ab-bn+2cn)÷n=a-b+2c;
(4)(3x3y2+x4y2-
1
2
xy)÷
1
2
xy=6x2y+2x3y-1.
故答案为:(1)-3×105;(2)
25
2
a-1x-2;(3)ab-bn+2cn;(4)
1
2
xy;6x2y;2x3y.
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