-4x^2y^2+4xy+2
＝-（4x^2y^2-4xy+1)+3
=3-(2xy-1)^2
=(根号3＋2xy-1)(根号3-2xy+1)
猜你喜欢
- 11.一个质点C在水平面上被两条等长的绳CA与CB与拉着而运动,两绳不可伸长,CA绳的末端A的速度为v1,方向沿CA方向,CB绳的末端B的速度为v2,方向沿CB方向,且CA与CB的夹角为a,
- 2Last Sunday I went s______in the car.I got to a supermarket,put my car nearby and went in.When l
- 3如图，在四棱锥P-ABCD中，底面ABCD中为菱形，∠BAD=60°，Q为AD的中点． （1）若PA=PD，求证：平面PQB⊥平面PAD； （2）点M在线段PC上，PM=tPC，试确定实数t的值，使得PA∥平面MQB．
- 4有两根绳子,一根长20米,另一根比它长1/5,另一根绳子长多少米?
- 5用"从...的...走来,我是...
- 6如果你还不睡觉,明天上班就要迟到了,这句用英语怎么说啊
- 7长7.5米直径2.54米的油罐油高分别为0.3米到1米的体积
- 8lucy Green is a student.She s__very hard at school.She likes playing computer games very much
- 9attach great importance
- 10i will not have enough time to study if后句