(1)6x²-2x-4x²+5x+1 (2)-ab³+3b³a (3)1/4x²y-3x²+3/4y²+2x² (4)-3x²y+2x²y+3xy²-2xy²
问题描述:
(1)6x²-2x-4x²+5x+1 (2)-ab³+3b³a (3)1/4x²y-3x²+3/4y²+2x² (4)-3x²y+2x²y+3xy²-2xy²
答
2x²+3x+1 2ab³ 1/4x²y-x²+3/4y² - x²y+xy²
答
哇好烦啊 2x²+3x+1 2ab³ 1/4x²y-x²+3/4y² - x²y+xy²
答
(1)6x²-2x-4x²+5x+1=(6x²-4x²)+(5x-2x)+1=(6-4)x²+(5-2)x+1=2x²+3x+1
(2)-ab³+3b³a=(-1+3)ab³=2ab³
(3)1/4x²y-3x²+3/4y²+2x²= 1/4x²y+(-3+2)x²+3/4y²
=1/4x²y-x²+3/4y²
(4)-3x²y+2x²y+3xy²-2xy² =(-3+2)x²y+(3-2)xy² =- x²y+xy²