问题
填空题
计算: b(2b2-b-3)=______; 2x•(3x2+4x+1)=______; (
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答案
b(2b2-b-3)=2b3-b2-3b;
2x•(3x2+4x+1)=6x3+8x2+2x;
(
x)2•(4xy-6y2)=1 2
x2•(4xy-6y2)=x3y-1 4
x2y2.3 2
故答案为:2b3-b2-3b;6x3+8x2+2x;x3y-
x2y23 2
计算: b(2b2-b-3)=______; 2x•(3x2+4x+1)=______; (
|
b(2b2-b-3)=2b3-b2-3b;
2x•(3x2+4x+1)=6x3+8x2+2x;
(
x)2•(4xy-6y2)=1 2
x2•(4xy-6y2)=x3y-1 4
x2y2.3 2
故答案为:2b3-b2-3b;6x3+8x2+2x;x3y-
x2y23 2