(1) (a²+b²)²-a²b² (2) 49(a-b)²-16(a+b)²(3) a²b²-2ab+1 (4) 9-12a+4a² (5)4x²+4x+1 (6) x²-6xy+9y²
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![(1) (a²+b²)²-a²b² (2) 49(a-b)²-16(a+b)²(3) a²b²-2ab+1 (4) 9-12a+4a² (5)4x²+4x+1 (6) x²-6xy+9y²](/uploads/image/z/1721912-32-2.jpg?t=%EF%BC%881%EF%BC%89+%28a%26%23178%3B%2Bb%26%23178%3B%29%26%23178%3B-a%26%23178%3Bb%26%23178%3B+%EF%BC%882%EF%BC%89+49%EF%BC%88a-b%EF%BC%89%26%23178%3B-16%EF%BC%88a%2Bb%EF%BC%89%26%23178%3B%EF%BC%883%EF%BC%89+a%26%23178%3Bb%26%23178%3B-2ab%2B1+%EF%BC%884%EF%BC%89+9-12a%2B4a%26%23178%3B+%EF%BC%885%EF%BC%894x%26%23178%3B%2B4x%2B1+%EF%BC%886%EF%BC%89+x%26%23178%3B-6xy%2B9y%26%23178%3B)
(1) (a²+b²)²-a²b² (2) 49(a-b)²-16(a+b)²(3) a²b²-2ab+1 (4) 9-12a+4a² (5)4x²+4x+1 (6) x²-6xy+9y²
(1) (a²+b²)²-a²b² (2) 49(a-b)²-16(a+b)²
(3) a²b²-2ab+1 (4) 9-12a+4a² (5)4x²+4x+1 (6) x²-6xy+9y²
(1) (a²+b²)²-a²b² (2) 49(a-b)²-16(a+b)²(3) a²b²-2ab+1 (4) 9-12a+4a² (5)4x²+4x+1 (6) x²-6xy+9y²
(1) (a²+b²)²-a²b² =(a²+b²+ab)(a²+b²-ab)
(2) 49(a-b)²-16(a+b)²=[7(a-b)+4(a+b)][7(a-b)-4(a+b)]=(11a-3b)(3a-11b)
(3) a²b²-2ab+1=(ab-1)²
(4) 9-12a+4a²=(3-2a)²
(5)4x²+4x+1=(2x+1)²
(6) x²-6xy+9y²=(x-3y)²