已知x-2y=3,求x²-4xy+4y²-3x+6y的值.
人气：493 ℃ 时间：2019-09-16 20:33:11
解答
x^2-4xy+4y^2-3(x-2y)
=(x-2y)^2-3(x-2y)
=9-3*3
=0
推荐
猜你喜欢
- 10米是8米的（ ）％?算式?
- 一个长方形长减少26厘米宽减少8厘米面积减少1568平方厘米,这时正好是一个正方形.求原长方形周长
- Today,the weather is good,I do at home eggs Fried rice.Although I did,but I still careful of stirring.When I need to put
- in,her,are,the,pants,drawer.连词成句
- 若函数f(x)=a^²-2x(其中a>0,且a≠1)在R上有最大值,则满足loga（x-3）＞0的取值范围
- 难溶于水的盐易溶于水的盐
- 一杯糖水,糖5克,水30克,另一杯,糖和糖水的比是1：6,第（ ）杯甜
- send us a copy of your sponsor letter and passport.家里人是sponsor怎么还要写信寄护照?
