(1)(x²+y²)²-x²y² (2)(3a+2b)²-(a-4b)² (3)2x-8x³ (5)9a的2n次方-4/9bb的4n次方(6)a的3n次方-a的n次方b²四、利用因式分解计算(1)68.3²-31.7²(2
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![(1)(x²+y²)²-x²y² (2)(3a+2b)²-(a-4b)² (3)2x-8x³ (5)9a的2n次方-4/9bb的4n次方(6)a的3n次方-a的n次方b²四、利用因式分解计算(1)68.3²-31.7²(2](/uploads/image/z/1998848-56-8.jpg?t=%EF%BC%881%EF%BC%89%EF%BC%88x%26%23178%3B%2By%26%23178%3B%EF%BC%89%26%23178%3B-x%26%23178%3By%26%23178%3B+%EF%BC%882%EF%BC%89%EF%BC%883a%2B2b%EF%BC%89%26%23178%3B-%EF%BC%88a-4b%EF%BC%89%26%23178%3B+%EF%BC%883%EF%BC%892x-8x%26%23179%3B+%EF%BC%885%EF%BC%899a%E7%9A%842n%E6%AC%A1%E6%96%B9-4%2F9bb%E7%9A%844n%E6%AC%A1%E6%96%B9%EF%BC%886%EF%BC%89a%E7%9A%843n%E6%AC%A1%E6%96%B9-a%E7%9A%84n%E6%AC%A1%E6%96%B9b%26%23178%3B%E5%9B%9B%E3%80%81%E5%88%A9%E7%94%A8%E5%9B%A0%E5%BC%8F%E5%88%86%E8%A7%A3%E8%AE%A1%E7%AE%97%EF%BC%881%EF%BC%8968.3%26%23178%3B-31.7%26%23178%3B%EF%BC%882)
(1)(x²+y²)²-x²y² (2)(3a+2b)²-(a-4b)² (3)2x-8x³ (5)9a的2n次方-4/9bb的4n次方(6)a的3n次方-a的n次方b²四、利用因式分解计算(1)68.3²-31.7²(2
(1)(x²+y²)²-x²y² (2)(3a+2b)²-(a-4b)² (3)2x-8x³
(5)9a的2n次方-4/9bb的4n次方
(6)a的3n次方-a的n次方b²
四、利用因式分解计算
(1)68.3²-31.7²
(2)99又3/8×100又5/8
(3)2.7×1.8²-1.2×1.2²
(4)201²-52+253×851
(1)(x²+y²)²-x²y² (2)(3a+2b)²-(a-4b)² (3)2x-8x³ (5)9a的2n次方-4/9bb的4n次方(6)a的3n次方-a的n次方b²四、利用因式分解计算(1)68.3²-31.7²(2
1.(x²+y²)²-x²y² =(x²+y²-xy)*(x²+y²+xy);
2.(3a+2b)²-(a-4b)² =(3a+2b-a+4b)*(3a+2b+a-4b)=(2a+6b)*(4a-2b);
3.2x-8x³ =2x*(1-4x²)=2x*(1-2x)*(1+2x);
5.6题没有看懂
四
(1)68.3²-31.7²=(68.3+31.7)*(68.3-31.7)=100*36.6=3660
(2)99又3/8×100又5/8=(100-5/8)*(100+5/8)=10000-25/64