Đáp án:
(5n+2)2−4=5n(5n+4).
Giải thích các bước giải: (5n+2)2−4=(5n+2)2−22=(5n+2−2)(5n+2+2)=5n(5n+4).
Rút gọn biểu thức
(5n+2) ²-4 = 25n ²+20n+4-4
= 25n ²+20n
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