各式因式分解测验题:
(1) aX2+2+X+2aX (2) 2aX2+3bX -4aX-6b
(3) X2-2aX+bX-2ab (4) X2+aX-bX-ab X2+aX-bX-ab
详解:
(1) aX2+2+X+2aX
= aX2+2aX)+(X+2) (分组)
= aX(X+2)+(X+2) (在 aX2+a中提出aX)
= (aX+1)(X+2) (提出X+2)
(2) 2aX2+3bX-4aX-6b
= (2aX2-4ax)+(3bX-6b) (分组)
= 2aX(X-2)+3b(X-2) (在 2aX2-4aX中提出2aX,3bX-6b中提出3b)
= (2aX+3b)(X-2) (提出X-2)
(3) X2-2aX+bX-2ab
= (X2+bX)-(2aX+2ab) (分组)
= X(X+b)-2a(X+b) (在X2+bX中提出X,2aX+2ab BX中提出 2a)
= (X-2a)(X+b) (提出X+b)
(4) X2+aX-bX-ab
= (X2+aX)-(bX+ab) (分组)
= X(X+a)-b(X+a) (在X2+aX中提出X,bX+ab中提出b)
= (X-b)(X+a) (提出X+a)
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