参考练习
(1)6x2÷(-2x)=_________.
(2)8x6y4z÷_______=4x2y2.
(3)(xy2-4x3y2)÷(-2xy2)=_______.
(4)(5a3b2+10a2b3)÷________=a+2b.
(5)()÷(3a2b3)=2a3b2-a2b+3.
(6)[6a2b2+________+________]÷________=3a+b-1.
2.选择题
(1)下列计算，结果正确的是()
A.8x6÷2x2=4x3B.10x6÷5x3=x3
C.(-2x2y2)3÷(-xy)3=-2x3y3D.(-xy2)2÷(-x2y)=-y3
(2)若xmyn÷x3y=4x2则()
A.m=6，n=1B.m=5，n=1
C.m=5，n=0D.m=6，n=0
(3)计算正确的是()
A.(9x4y3-12x3y4)÷3x3y2=3xy-4xy2
B.(28a3-14a2+7a)÷7a=4a2-2a+7a
C.(-4a3+12a2b-7a3b2)÷(-4a2)=a-3b+ab2
D.(25x2+15x2y-20x4)÷(-5x2)=-5-3xy+4x2
3.计算
(1)(102)3×104÷(-103)3.
(2)[(x+y)(x-y)-(x-y)2+2y(x-y)]÷4y.
答案：
1.(1)-3x(2)2x4y2z(3)-+2x2(4)5a2b2(5)6a5b5-3a4b4+9a2b3
(6)2ab3，-2ab2，2ab2
2.(1)D(2)B(3)C
3.(1)-10(2)x-y