(x²+4x)-(y²-4y)
=x²-y²+4x+4y
=(x+y)(x-y)+4(x+y)
=(x+y)(x-y+4)
祝你学习进步!
猜你喜欢
- 12001-2000-1999+1998+1997-1996+1995-1994-1993+1992+1991-1990+………+9-8-7+6+5-4+3-2-1
- 2判断题:乙数比甲数多30%,则甲数是乙数的70%.
- 3窃读记读后感400字
- 4元素周期表 主族元素包括那几个周期,副族呢
- 5My father is (tall)in my family.
- 6用化学用于表示出以下含义:硫酸钠中硫元素的化合价为+6价
- 7the large hall built -----was destroyed in the terrible earthquake A in 1940s B in the 1940 C durin
- 8七下数学作业本第四章复习题第7题答案
- 9怎样复习初一地理
- 10求化学实验报告