平方差
(x-y)(x+y)=3
(x+y)^2(x-y)^2
=【(x-y)(x+y)】^2
=9本回答被提问者采纳
=(x^2-y^2)^2
=9
若x^2-y^2=3,则(x+y)^2(x-y)^2的值是
x^2-y^2=3 平方差 (x-y)(x+y)=3 (x+y)^2(x-y)^2 =【(x-y)(x+y)】^2 =9
1.若 X^2-y^2=4 则(x+y)^2(x-y)^2的值是?
1.若 X^2-y^2=4 则(x+y)^2(x-y)^2的值是？(x+y)^2(x-y)^2 =[(x+y)(x-y)]²=16 2.定义一种新运算，其法则为a△b=ab-a+b，则（a-b）△（a+b）= （a-b）△（a+b）=(a-b)(a+b)-(a-b)+(a+b)=a²-b²+2b 3.若单项式-2a^3b^m与单...
已知:x^2-y^2=3,则(x+y)^2*(x-y)^2=9 对吧
解：x^2-y^2=(x+y)(x-y)(x+y)^2*(x-y)^2=(x+y)(x-y)(x+y)(x-y)=3×3=9 对的
已知实数x,y满足关系式x^2+xy+y^2=3,则(x-y)^2最大值为?
几何意义是求椭圆的切线 直线与椭圆相切的时候值最大
1.如果x^2-y^2=4,求(x-y)^2(x-y)^2的值 2.计算(a+b)^2(a^2-
（x+y)^2(x-y)^2=（x^2-y^2)^2=4^2=16 2.计算（a+b)^2(a^2-2ab+b^2)=(a+b)²(a-b)²=(a²-b²)²=a^4-2a²b²+b^4 3.计算(x-y+2)^2-(x-y)^2=(x-y)²+4(x-y)+4-(x-y)²=4x-4y+4 4.若a^2...
已知x的2次方+y的2次方=3,x+y=2,求xy的值
x^2+y^2=3 (x+y)^2=x^2+2xy+y^2=4 所以2xy=4-x^2-y^2=4-3=1 所以xy=1\/2
x^2+ xy + y^2 =3 , 求函数 x^2 - xy + y^2 值域
简单分析，详情如图所示
已知(x+y)^2=6,(x-y)^2=3,求xy,x^2y^2,x^2+y^2的值
两式相减得到xy=3\/4，平方后得到x^2y^2=9\/16，将xy值代入两式中的任何一个得到x^2+y^2=9\/2
x^2-xy-y^2=3, 求 x+y 的最小值
x+y无最小值，方法如下，请作参考：若有帮助，请采纳。
已知x+y=3,xy=1,求x^2+y^2;(x-y)^2;x^3y^2+x^2y^3的值
(x+y)²=3²x²+2xy+y²=9 x²+y²=9-2xy =9-2×1 =7 (x-y)²=x²-2xy+y²=7-2×1 =5 x³y²+x²y³=x²y²(x+y)=1²×3 =3 ...
