计算(a-b)(a+b)(a2+b2)(a4-b4)的结果是( )A.a8+2a4b4+b8B.a8-2a4b4+b8C.a8+b8D.a8-b8
题型:单选题难度:简单来源:不详
计算(a-b)(a+b)(a2+b2)(a4-b4)的结果是( )A.a8+2a4b4+b8 | B.a8-2a4b4+b8 | C.a8+b8 | D.a8-b8 |
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答案
(a-b)(a+b)(a2+b2)(a4-b4), =(a2-b2)(a2+b2)(a4-b4), =(a4-b4)2, =a8-2a4b4+b8. 故选B. |
举一反三
已知a-b=3,a2-b2=9,则a=______,b=______. |
下列算式能用平方差公式计算的是( )A.(x+1)(-x-1) | B.(3a+b)(3b-a) | C.(x-y)(-x-y) | D.(-m+n)(-m+n) |
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计算:(x+1)(x-1)(x2-1)=______. |
计算:(3x-2)2=______;(-a+2b)(a+2b)=______. |
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