(a-2b+3c)²-(a+2b-3c)²
=(a-2b+3c+a+2b-3c)【(a-2b+3c)-(a+2b-3c)】
=(2a)(-4b+6c)
=-4a(2b-3c)用平方差公式或完全平方公式好了加分用的就是平方差公式啊。哦
猜你喜欢
- 1"Do not do to others what you would not like yourself"是什么意思?
- 2已知实数x,y满足 2x-y-2≥0,x-2y+2≥0,x+y-13≤0,则z=xy的最大值为多少啊
- 3Would you like to sit over here,facing the engine?
- 4李阿姨开了一家服装店,其中一套西装的进价为1000元,售价为1200元,则这套西装可盈利-、利润率是?
- 5作文《我为父母做___》写什么好啊?速度速度!明天就要交了啊!提供建议就行了.
- 6People use metal for making machines.改为被动句
- 7幼儿园给大班、小班分水果,大班每人分得3个苹果和1个梨,小班每人分得5个苹果和2个梨,结果发现小班比大班少分得24个苹果. (1)如果两个班分得的梨一样多,那么小班有_人. (2)
- 8硒酸与烧碱发生中和反应的化学方程式
- 9It was two years later that ...与It was two years before...的区别是?
- 10What ___ ___ ___ ____ ____?She usually wears green blouse and white skirt.用所给的适当动词填空