题目内容
计算:
b(2b2-b-3)=______;
2x•(3x2+4x+1)=______;
(
x)2•(4xy-6y2)=______.
b(2b2-b-3)=______;
2x•(3x2+4x+1)=______;
(
| 1 |
| 2 |
b(2b2-b-3)=2b3-b2-3b;
2x•(3x2+4x+1)=6x3+8x2+2x;
(
x)2•(4xy-6y2)=
x2•(4xy-6y2)=x3y-
x2y2.
故答案为:2b3-b2-3b;6x3+8x2+2x;x3y-
x2y2
2x•(3x2+4x+1)=6x3+8x2+2x;
(
| 1 |
| 2 |
| 1 |
| 4 |
| 3 |
| 2 |
故答案为:2b3-b2-3b;6x3+8x2+2x;x3y-
| 3 |
| 2 |
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