佳能办公室主任
幼苗
共回答了17个问题采纳率:76.5% 举报
(2a+1/2b)²(2a-1/2b)²
=[(2a+1/2b)*(2a-1/2b)]²
=[(2a)^2-(1/2b)^2]²
=(4a^2-1/4b^2)²
=16a^4-2a^2b^2+1/16b^4
2.6(7+1)(7²+1)(7四次方+1)-(7八次方+1)+1
=(7-1)(7+1)(7²+1)(7四次方+1)-(7八次方+1)+1
=(7²-1)(7²+1)(7四次方+1)-(7八次方+1)+1
=(7四次方-1)(7四次方+1)-(7八次方+1)+1
=7八次方-1-(7八次方+1)+1
=-1
1年前
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