12点之前 ,,不回答的,别废话,没你说话份.,1.利用因式分解计算:(1)21×3.14+62×3.14+17×3.14;(2)758²-258² 2.分解因式:(1)(a-b)²+4ab; (2)(p-4)(p+1)+3p;(3)4xy²-4x²y-y&s
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![12点之前 ,,不回答的,别废话,没你说话份.,1.利用因式分解计算:(1)21×3.14+62×3.14+17×3.14;(2)758²-258² 2.分解因式:(1)(a-b)²+4ab; (2)(p-4)(p+1)+3p;(3)4xy²-4x²y-y&s](/uploads/image/z/13534970-50-0.jpg?t=12%E7%82%B9%E4%B9%8B%E5%89%8D+%2C%2C%E4%B8%8D%E5%9B%9E%E7%AD%94%E7%9A%84%2C%E5%88%AB%E5%BA%9F%E8%AF%9D%2C%E6%B2%A1%E4%BD%A0%E8%AF%B4%E8%AF%9D%E4%BB%BD.%2C1.%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%9A%EF%BC%881%EF%BC%8921%C3%973.14%2B62%C3%973.14%2B17%C3%973.14%EF%BC%9B%EF%BC%882%EF%BC%89758%26sup2%3B-258%26sup2%3B+2.%E5%88%86%E8%A7%A3%E5%9B%A0%E5%BC%8F%EF%BC%9A%EF%BC%881%EF%BC%89%EF%BC%88a-b%EF%BC%89%26sup2%3B%2B4ab%EF%BC%9B+%EF%BC%882%EF%BC%89%EF%BC%88p-4%29%28p%2B1%EF%BC%89%2B3p%EF%BC%9B%EF%BC%883%EF%BC%894xy%26sup2%3B-4x%26sup2%3By-y%26s)
12点之前 ,,不回答的,别废话,没你说话份.,1.利用因式分解计算:(1)21×3.14+62×3.14+17×3.14;(2)758²-258² 2.分解因式:(1)(a-b)²+4ab; (2)(p-4)(p+1)+3p;(3)4xy²-4x²y-y&s
12点之前 ,,不回答的,别废话,没你说话份.,
1.利用因式分解计算:
(1)21×3.14+62×3.14+17×3.14;
(2)758²-258²
2.分解因式:
(1)(a-b)²+4ab; (2)(p-4)(p+1)+3p;
(3)4xy²-4x²y-y³; (4)3ax²-3ay²
3.已知4y²+my+9是完全平方式,求m的值.
4.观察下列式子:
2×4+1=9=3²; 6×8+1=49=7²; 14×16+1=225=15²
5.在实数范围内分解因式:
(1)x²-2 ; (2)5x²-3..
(提示:根据平方根的意义把各式写成平方差形式)
12点之前 ,,不回答的,别废话,没你说话份.,1.利用因式分解计算:(1)21×3.14+62×3.14+17×3.14;(2)758²-258² 2.分解因式:(1)(a-b)²+4ab; (2)(p-4)(p+1)+3p;(3)4xy²-4x²y-y&s
1.(1)原式=3.14×(21+62+17)=314
(2) 原式=(758+258)×(758-258)=508000
2.(1)原式=a²-2ab+b²+4ab
=a+2ab+b²
=(a+b)²
(2)原式=p²-3p-4+3p
=(p+2)(p-2)
(3)原式=-y(4x²-4xy+y²)
=-y(2x-y)²
(4)原式=3a(x+y)x-y)
3.原式=(2y)²+my+3²,
依题意,2·2y×3=my
m=12
4.规律:(a-1)(a+1)+1=a²
5.(1)原式=(x+√2)(x-√2)
(2)原式=(√5x+√3)(√5x-√3)