化简&因式分解
问题描述:
化简&因式分解
化简:898*902+4
因式分解:1)x∧2+2xy+y∧2-x-y
2)3x∧2y-6xy+3y
答
化简:
898*902+4
=(900-2)*(900+2)+4
=900²-4+4
=900²
=810000
1)x²+2xy+y²-x-y
=(x+y)²-(x+y)
=(x+y)(x+y-1)
2)3x²y-6xy+3y²
=3y(x²-2x+1)
=3y(x-1)²