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歡迎您訪問數(shù)學(xué)考題練習(xí):因式分解:(1)6q(2p+3q)+4p(3q!

數(shù)學(xué)考題練習(xí):因式分解:(1)6q(2p+3q)+4p(3q

更新時(shí)間:2024-01-12 16:32:22作者:貝語網(wǎng)校

因式分解:

(1)6q(2p+3q)+4p(3q+2p);

(2)-x2+6xy-9y2+1;

(3)(x2+x)2-(x+1)2

(4)-anb2+a3n

試題答案

解:(1)6q(2p+3q)+4p(3q+2p)=2(2p+3q)(3q+2p)=2(3q+2p)2

(2)-x2+6xy-9y2+1=1-(x-3y)2=(1+x-3y)(1-x+3y);

(3)(x2+x)2-(x+1)2=(x2+x+x+1)(x2+x-x-1)

=(x2+2x+1)(x2-1)

=(x+1)2(x+1)(x-1)

=(x+1)3(x-1);

(4)-anb2+a3n=-an(b2-a2n

=-an(b+an)(b-an).

試題解析

(1)提取公因式2(2p+3q)即可求得答案;

(2)利用分組分解法,采用一三分組法,再利用平方差公式求解即可求得答案;

(3)先利用平方差公式分解,再利用完全平方公式與平方差公式進(jìn)行二次分解即可求得答案;

(4)先提取公因式-an,再根據(jù)平方差公式進(jìn)行二次分解即可求得答案.

點(diǎn)評(píng):本題考查了提公因式法,公式法以及分組分解法分解因式.注意因式分解的步驟:先提公因式,再用公式法分解.注意分解要徹底.

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