因式分解(1)2x²+15x+7;(2)3a²-8a+4;(3)5x²+7x-6;下接(4)↓(4)6y²-11y-10;(5)解方程x²-2x=3;(6)(x+y)²+4(x+y)+3; (7)(m+n)²-3(m+n)+2;(8)x²-7x+6;(9)3x
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![因式分解(1)2x²+15x+7;(2)3a²-8a+4;(3)5x²+7x-6;下接(4)↓(4)6y²-11y-10;(5)解方程x²-2x=3;(6)(x+y)²+4(x+y)+3; (7)(m+n)²-3(m+n)+2;(8)x²-7x+6;(9)3x](/uploads/image/z/1997737-25-7.jpg?t=%E5%9B%A0%E5%BC%8F%E5%88%86%E8%A7%A3%EF%BC%881%EF%BC%892x%26%23178%3B%2B15x%2B7%EF%BC%9B%EF%BC%882%EF%BC%893a%26%23178%3B-8a%2B4%EF%BC%9B%EF%BC%883%EF%BC%895x%26%23178%3B%2B7x-6%EF%BC%9B%E4%B8%8B%E6%8E%A5%EF%BC%884%EF%BC%89%E2%86%93%EF%BC%884%EF%BC%896y%26%23178%3B-11y-10%EF%BC%9B%EF%BC%885%EF%BC%89%E8%A7%A3%E6%96%B9%E7%A8%8Bx%26%23178%3B-2x%3D3%EF%BC%9B%EF%BC%886%EF%BC%89%28x%2By%29%26%23178%3B%2B4%28x%2By%29%2B3%EF%BC%9B+%EF%BC%887%EF%BC%89%28m%2Bn%29%26%23178%3B-3%28m%2Bn%29%2B2%EF%BC%9B%EF%BC%888%EF%BC%89x%26%23178%3B-7x%2B6%EF%BC%9B%EF%BC%889%EF%BC%893x%26%2317)
因式分解(1)2x²+15x+7;(2)3a²-8a+4;(3)5x²+7x-6;下接(4)↓(4)6y²-11y-10;(5)解方程x²-2x=3;(6)(x+y)²+4(x+y)+3; (7)(m+n)²-3(m+n)+2;(8)x²-7x+6;(9)3x
因式分解(1)2x²+15x+7;(2)3a²-8a+4;(3)5x²+7x-6;下接(4)↓
(4)6y²-11y-10;(5)解方程x²-2x=3;(6)(x+y)²+4(x+y)+3; (7)(m+n)²-3(m+n)+2;(8)x²-7x+6;(9)3x²+2x-1;(10)x²+5x-6;(11)4x²-5x-9;(12)15x²-23x+8;
(5)补充:解方程x²+3x-10=0
原方程可化为(x+5)(x-2)=0
∴x+5=0或x-2=0
由x+5=0得x=-5
由x-2=0得x=2
∴x=-5或x=2为原方程的解.
第5题要完成过程,剩下的题可以直接出答案,
因式分解(1)2x²+15x+7;(2)3a²-8a+4;(3)5x²+7x-6;下接(4)↓(4)6y²-11y-10;(5)解方程x²-2x=3;(6)(x+y)²+4(x+y)+3; (7)(m+n)²-3(m+n)+2;(8)x²-7x+6;(9)3x
(4)6y²-11y-10
=(2y-5)(3y+2)
(5)解方程x²-2x=3
x²-2x-3=0
(x-3)(x+1)=0
x=3或x=-1
(6)(x+y)²+4(x+y)+3
=(x+y+3)(x+y+1)
(7)(m+n)²-3(m+n)+2
=(m+n-2)(m+n-1)
(8)x²-7x+6
=(x-6)(x-1)
(9)3x²+2x-1
=(3x+1)(x-1)
(10)x²+5x-6
=(x+6)(x-1)
(11)4x²-5x-9
=(4x-9)(x+1)
(12)15x²-23x+8
=(15x-8)(x-1)