题目内容

【题目】(1)

(2)20132﹣2012×2014(简便计算)

(3)(3a23+a2a4﹣a8÷a2

(4)(x﹣2)(3x﹣1)

(5)(x﹣1)(x+1)﹣(x+2)2

(6)(a+3b﹣2c)(a﹣3b﹣2c)

(7)(m﹣2n+1)2

(8)(2a﹣3b)2(2a+3b)2

【答案】(1)11;(2)1;(3)27a6;(4)3x2﹣7x+2;(5)﹣4x﹣5;(6)a2﹣4ac+4c2﹣9b2;(7)m2﹣4mn+4n2+2m﹣4n+1;(8)16a4﹣72a2b2+81b4

【解析】(1)
=1+1+9
=11;
(2)20132﹣2012×2014
=20132﹣(2013﹣1)×(2013+1)
=1;
(3)(3a23+a2a4﹣a8÷a2
=27a6+a6﹣a6
=27a6
(4)(x﹣2)(3x﹣1)
=3x2﹣7x+2;
(5)(x﹣1)(x+1)﹣(x+2)2
=x2﹣1﹣x2﹣4x﹣4
=﹣4x﹣5;

(6)(a+3b﹣2c)(a﹣3b﹣2c)
=(a﹣2c)2﹣9b2
=a2﹣4ac+4c2﹣9b2
(7)(m﹣2n+1)2
=(m﹣2n)2+2m﹣4n+1
=m2﹣4mn+4n2+2m﹣4n+1;
(8)(2a﹣3b)2(2a+3b)2
=(4a2﹣9b22
=16a4﹣72a2b2+81b4

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