课后提升选择题答案
1 | 2 | 3 | 4 | 5 |
C | C | C | B | C |
课后提升第6题答案
(1) 4y2-x2
(2)-(1/3)y;5x
课后提升第7题答案
9x⁴ⁿ-4
课后提升第8题答案
(a+b)(a-b)=a2-b2
课后提升第9题答案
解:(1)原式=x2-y2+x2-y2=2x2-2y2;
(2)原式=a2-4b2-(1/2)ab+4b2=a2-(1/2)ab;
(3)原式=(a2-b2)(a2+b2)(a⁴+b⁴) =(a⁴-b⁴)(a⁴+b⁴) =a⁸-b⁸
课后提升第10题答案
解:(1)原式=(10+1/4)×(10-1/4)
=102-(1/4)2
=100-1/16
=99(15/16);
(2)原式= (2015+1)(2015-1) -20152
=20152 -1-20152 =-1
(3)
=2016