4a²-(_)²=(2a+_________)(_____________-1/3b)还有一道题目 a²-4ab+_____=(_______-______)²-a²-2ab-b²=______
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4a²-(_)²=(2a+_________)(_____________-1/3b)还有一道题目 a²-4ab+_____=(_______-______)²-a²-2ab-b²=______
4a²-(_)²=(2a+_________)(_____________-1/3b)
还有一道题目 a²-4ab+_____=(_______-______)²
-a²-2ab-b²=______
4a²-(_)²=(2a+_________)(_____________-1/3b)还有一道题目 a²-4ab+_____=(_______-______)²-a²-2ab-b²=______
4a²-(1/3b)²=(2a+1/3b)(2a-1/3b)
a²-4ab+4b²=(a-2b)²
-a²-2ab-b²=-(a+b)²