(1)4n²+4n-15; (2)6a²+a-35;(3)5x²-8x-13; (4)4x²+15x+9(5)15x²+x-2; (6)6y²+19y+10;(7)20-9y-20y²; (8)7(x-1) ²+4(x-1)(y+2)-20(y+2)
来源:学生作业帮助网 编辑:作业帮 时间:2024/09/01 11:08:26
![(1)4n²+4n-15; (2)6a²+a-35;(3)5x²-8x-13; (4)4x²+15x+9(5)15x²+x-2; (6)6y²+19y+10;(7)20-9y-20y²; (8)7(x-1) ²+4(x-1)(y+2)-20(y+2)](/uploads/image/z/5604693-69-3.jpg?t=%281%294n%26%23178%3B%2B4n%EF%BC%8D15%EF%BC%9B+%282%296a%26%23178%3B%2Ba%EF%BC%8D35%EF%BC%9B%283%295x%26%23178%3B%EF%BC%8D8x%EF%BC%8D13%EF%BC%9B+%284%294x%26%23178%3B%2B15x%2B9%285%2915x%26%23178%3B%2Bx%EF%BC%8D2%EF%BC%9B+%286%296y%26%23178%3B%2B19y%2B10%EF%BC%9B%287%2920%EF%BC%8D9y%EF%BC%8D20y%26%23178%3B%EF%BC%9B+%288%297%28x%EF%BC%8D1%29+%26%23178%3B%2B4%28x%EF%BC%8D1%29%28y%2B2%29%EF%BC%8D20%28y%2B2%29)
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(1)4n²+4n-15; (2)6a²+a-35;(3)5x²-8x-13; (4)4x²+15x+9(5)15x²+x-2; (6)6y²+19y+10;(7)20-9y-20y²; (8)7(x-1) ²+4(x-1)(y+2)-20(y+2)
(1)4n²+4n-15; (2)6a²+a-35;
(3)5x²-8x-13; (4)4x²+15x+9
(5)15x²+x-2; (6)6y²+19y+10;
(7)20-9y-20y²; (8)7(x-1) ²+4(x-1)(y+2)-20(y+2)
(1)4n²+4n-15; (2)6a²+a-35;(3)5x²-8x-13; (4)4x²+15x+9(5)15x²+x-2; (6)6y²+19y+10;(7)20-9y-20y²; (8)7(x-1) ²+4(x-1)(y+2)-20(y+2)
(7) 20-9y-20y²=-(20y²+9y-20)=-(4y+5)(5y-4)=(4-5y)(5+4y)
(8)7(x-1) ²+4(x-1)(y+2)-20(y+2)=[(x-1)+2(y+2)][7(x-1)-10(y+2)]