题目内容
(1)3x2•2x3
(2)3a2•(-
a3)
(3)(-8xy3)•
xy2z
(4)(-
xy)•(-15xy)
(5)(-3ab)•(-ab)
(6)-6m2n•
mn2.
(2)3a2•(-
2 |
3 |
(3)(-8xy3)•
1 |
4 |
(4)(-
4 |
5 |
(5)(-3ab)•(-ab)
(6)-6m2n•
1 |
2 |
(1)3x2•2x3=3×2x2•x3=6x5;
(2)3a2•(-
a3)=-3×
a2•a3=-2a5;
(3)(-8xy3)•
xy2z=-8×
xy3•xy2z=-2x2y5z;
(4)(-
xy)•(-15xy)=
×15xy•xy=12x2y2;
(5)(-3ab)•(-ab)=3a2b2;
(6)-6m2n•
mn2=-6×
m2n•mn2=-3m3n3.
(2)3a2•(-
2 |
3 |
2 |
3 |
(3)(-8xy3)•
1 |
4 |
1 |
4 |
(4)(-
4 |
5 |
4 |
5 |
(5)(-3ab)•(-ab)=3a2b2;
(6)-6m2n•
1 |
2 |
1 |
2 |
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