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It is known that the square of a + AB = 3 and the square of B + AB = 2 1. Find the square of a + 2Ab + B 2. Find the square of a - the square of B
1、a²+2ab+b²=（a²+ab)+(b²+ab)=3+2=5
2、a²-b²=(a²+ab)-(b²+ab)=3-2=1
That's all
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