9(a-b) ²+12(a²-b²)+4(a+b)²=
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![9(a-b) ²+12(a²-b²)+4(a+b)²=](/uploads/image/z/7622531-35-1.jpg?t=9%EF%BC%88a-b%29+%26%23178%3B%2B12%28a%26%23178%3B-b%26%23178%3B%29%2B4%28a%2Bb%29%26%23178%3B%3D)
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9(a-b) ²+12(a²-b²)+4(a+b)²=
9(a-b) ²+12(a²-b²)+4(a+b)²=
9(a-b) ²+12(a²-b²)+4(a+b)²=
原式=[3(a-b)+2(a+b)]²
=(5a-b)²
原式=[3(a-b)+2(a+b)]²
=(5a-b)²
9(a-b) ²+12(a²-b²)+4(a+b)²
=9a²-18ab+9b²+12a²-12b²+4a²+8ab+4b²
=25a²-10ab+b²