1、根据(x-y)(x+y)=x^2-y^2,用(x-y)(x+y)做外项,写成比例式为__________
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1、根据(x-y)(x+y)=x^2-y^2,用(x-y)(x+y)做外项,写成比例式为__________
2、化简:√[2x+13+√(128x-192)]-√[2x-2+√(8x-12)](请提供解题思路或者过程)
3、设√(23-√448)的整数部分为a,小数部分为b,求a^2-b^2的值.(同上)
4、Mary was born _____ the morning____July 12
A.on...in B.in...on C.on...of D.of...on
5、I prefer _______ to _______ .
A.read books.watch TV
B.reading books.watch TV
C.to read books.watch TV
D.reading books.watching TV
2、化简:√[2x+13+√(128x-192)]-√[2x-2+√(8x-12)](请提供解题思路或者过程)
3、设√(23-√448)的整数部分为a,小数部分为b,求a^2-b^2的值.(同上)
4、Mary was born _____ the morning____July 12
A.on...in B.in...on C.on...of D.of...on
5、I prefer _______ to _______ .
A.read books.watch TV
B.reading books.watch TV
C.to read books.watch TV
D.reading books.watching TV
4.C
5.D
5.D
1/5x=4y改成比例式x:y():().
1、x(x-y)(x+y)-x(x+y)^2
(1)(x^2/x)-y-x-y
[(-x-y)(-x+y)-(x+y)^2-x(y-y^2)}÷1/2y
[x(x-y)-y(x-y)+(x+y)(x-y)]÷2x其中x=2012 y=2013
把方程2x-y=1写成用x的代数式表示y的形式,y=,写成y表示x的形式,x=
先化简再求值(x-y)(x+y)-(x-2y) 的完全平方+x(3x-5y)-(x-y)(x-2y),其中x=1/2 y
分式的加减:[(x/y-y/x)除以(x+y)+x(1/y-1/x)]除以1+x/y,其中x=5,y=2
把Y-5X=3写成Y是X的函数关系式为__________;写成X是Y的函数形式为__________.
{(x,y) |x|+|y|
x>y?x:y
x=1-y/2+y改写成y=f(x)的形式