Y=x的平方-3x+5
y=(x^2-3x)+5
=(x^2-3x+9/4-9/4)+5
=(x-3/2)^2-9/4+20/4
=(x-3/2)^2+11/4
猜你喜欢
- 1淀粉溶液中加入少量的稀硫酸,水浴加热,最终可以得到葡萄糖溶液
- 2Ca怎么转化成CaO?需要在什么条件下反应?
- 3The wheel is thought to be an invention of the first important in human history.和
- 46点6分什么意思
- 5一个数乘10，得到的数比原来的数多72．原来的数是多少？
- 6传热学中平均温差法与传热单元数法的区别
- 71.I can tell her everything because she can keep a secret(对because she can keep a secret提问）
- 8在一个正方体水槽里垂直放入一根长3dm,宽和高都是5cm的铁棒,水面会上升多少cm?
- 9写出两个含雨的诗句；写出两个含雪的诗句；写出两句抒写思念故乡,眷念亲友的诗句.
- 10His grandpa is over seventy.but he is still at good healthy哪错啦?