瀹炵敤鏂囨。
鏂囨澶у叏
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涓�銆佹彁鍏洜寮忔硶
.
锛?/p>
ma+mb+mc=m(a+b+c)
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.
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寮忓垎瑙ｄ腑甯哥敤鐨勫叕寮忥紝渚嬪锛?/p>
锛?/p>
1
锛?/p>
(a+b)(a-b) = a
2
-b
2
---------a
2
-b
2
=(a+b)(a-b)
锛?/p>
(2) (a
卤
b)
2
= a
2
卤
2ab+b
2
鈥斺�斺�?/p>
a
2
卤
2ab+b
2
=(a
卤
b)
2
锛?/p>
(3) (a+b)(a
2
-ab+b
2
) =a
3
+b
3
------ a
3
+b
3
=(a+b)(a
2
-ab+b
2
)
锛?/p>
(4) (a-b)(a
2
+ab+b
2
) = a
3
-b
3
------a
3
-b
3
=(a-b)(a
2
+ab+b
2
)
锛?/p>
涓嬮潰鍐嶈ˉ鍏呬袱涓父鐢ㄧ殑鍏紡锛?/p>
(5)a
2
+b
2
+c
2
+2ab+2bc+2ca=(a+b+c)
2
锛?/p>
(6)a
3
+b
3
+c
3
-3abc=(a+b+c)(a
2
+b
2
+c
2
-ab-bc-ca)
锛?/p>
渚?/p>
.
宸茬煡
a
b
c
锛?/p>
锛?/p>
鏄?/p>
ABC
飦?/p>
鐨勪笁杈癸紝涓?/p>
2
2
2
a
b
c
ab
bc
ca
飥?/p>
飥?/p>
飥?/p>
飥?/p>
飥?/p>
锛?/p>
鍒?/p>
ABC
飦?/p>
鐨勫舰鐘舵槸锛?/p>
锛?/p>
A.
鐩磋涓夎褰?/p>
B
绛夎叞涓夎褰?/p>
C
绛夎竟涓夎褰?/p>
D
绛夎叞鐩磋涓夎褰?/p>
涓夈�佸垎缁勫垎瑙ｆ硶
.
锛堜竴锛夊垎缁勫悗鑳界洿鎺ユ彁鍏洜寮?/p>
渚?/p>
1
銆佸垎瑙ｅ洜寮忥細
bn
bm
an
am
飥?/p>
飥?/p>
飥?/p>