计算题:(1)?2?2+|14|?(π?2011)0?1÷(?3)?1(2)201120102?2009×2011(3)a3?a3+(-2a3)2+(a2)3(
计算题:(1)?2?2+|14|?(π?2011)0?1÷(?3)?1(2)201120102?2009×2011(3)a3?a3+(-2a3)2+(a2)3(4)(25...
计算题:(1)?2?2+|14|?(π?2011)0?1÷(?3)?1(2)201120102?2009×2011(3)a3?a3+(-2a3)2+(a2)3(4)(25m2+15m3n-20m4)÷(-5m2)(5)(x-1)(x+2)+(-x+1)(x-3)(6)(a+b-c)(a-b+c)
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(1)?2?2+|
|?(π?2011)0?1÷(?3)?1
=-
+
-1+3
=2;
(2)
=
=
=2011;
(3)a3?a3+(-2a3)2+(a2)3
=a6+4a6+a6
=6a6;
(4)(25m2+15m3n-20m4)÷(-5m2)
=-5-3mn+4m2;
(5)(x-1)(x+2)+(-x+1)(x-3)
=(x2+2x-x-2)+(-x2+3x+x-3)
=x2+x-2-x2+4x-3
=5x-5;
(6)(a+b-c)(a-b+c)
=[a+(b-c)][a-(b-c)]
=a2-(b-c)2
=a2-b2+2bc-c2.
1 |
4 |
=-
1 |
4 |
1 |
4 |
=2;
(2)
2011 |
20102?2009×2011 |
=
2011 |
20102?(2010?1)×(2010+1) |
=
2011 |
20102?20102+1 |
=2011;
(3)a3?a3+(-2a3)2+(a2)3
=a6+4a6+a6
=6a6;
(4)(25m2+15m3n-20m4)÷(-5m2)
=-5-3mn+4m2;
(5)(x-1)(x+2)+(-x+1)(x-3)
=(x2+2x-x-2)+(-x2+3x+x-3)
=x2+x-2-x2+4x-3
=5x-5;
(6)(a+b-c)(a-b+c)
=[a+(b-c)][a-(b-c)]
=a2-(b-c)2
=a2-b2+2bc-c2.
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