【急】2个初二因式分解(十字相乘法)
x^2 + ( 3m + n )x + 3mn
要过程
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x^2 - 2ax - 2a - 1
要过程
参考答案:yes, it's easy.
(1)=(x+3m)(x+n);
(2)=[x-(2a+1)][x+1]
x^2 + ( 3m + n )x + 3mn
要过程
-------------
x^2 - 2ax - 2a - 1
要过程
参考答案:yes, it's easy.
(1)=(x+3m)(x+n);
(2)=[x-(2a+1)][x+1]