(5x+7y—3)(—7+3+5x)用平方差公式怎么算
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(5x+7y—3)(—7+3+5x)用平方差公式怎么算(5x+7y—3)(—7+3+5x)用平方差公式怎么算(5x+7y—3)(—7+3+5x)用平方差公式怎么算(5x+7y—3)(—7y+3+5x)
(5x+7y—3)(—7+3+5x)用平方差公式怎么算
(5x+7y—3)(—7+3+5x)用平方差公式怎么算
(5x+7y—3)(—7+3+5x)用平方差公式怎么算
(5x+7y—3)(—7y+3+5x) 题目少了个y吧
=[5x+(7y-3)][5x-(7y-3)]
=(5x)^2-(7y-3)^2
=25x^2-49y^2+42y-9
用递归法求y=x-(x*x*x/3!)+(x*x*x*x*x/5!)-(x*x*x*x*x*x*x/7!)+.
(3x-4y)(5x-4y)-(7x-8y)(6y-5x)
化简:3(x-y)²-7(x-y)+ 2(x-y)²+5(x-y)
计算(x^8-x^7y+x^5y^3-x^4y^4+x^3y^5-x^y^7+y^8)(x^2+xy+y^2)
3x+5y-(x+y)=6 2(x+y)-3x=-7
2x—3y+5=0 3x+2y=12 y=2x 7x—3y=4 Y+1=三分之x+1 2x—3y=1 方程组
把(X+y)和(X-y)的平方各看成—项.合并-3(X-y)的平方-7(x-y)+5(x+y)的平方+9(x+y)中的同类项
5x+7y-3x
5(x-y)³-3(x-y)²+7(x-y)-5(x-y)³+(x-y)²-5(x-y),其中,x-y=1/3.5(x-y)³-3(x-y)²+7(x-y)-5(x-y)³+(x-y)²-5(x-y),其中,x-y=1/3先化简,再求值;
若2x-3y+4=0则x(x*x-1)+x(5-x*x)-6y+7
—2x+5(x+2y)—(x—3y) 3x+2(y-x)-(-x-4y) (x-2y)-(y-3—2x+5(x+2y)—(x—3y) 3x+2(y-x)-(-x-4y)(x-2y)-(y-3x)
1.方程2x+y/2=5x+2y/4=1,求x+2y+1/2x—3y+7
-(5x+y)-7(x-y) -2分之1(x+y)+4分之1(x+2y) 4x-2(x-2) -2x-(3x-1) x-(5x-2y)+2(2x-y)
若x+y分之x-y=3,求式子x+y分之5(x-y)—2(x-y)分之x+y的值
若x-y分之x+y=3,求式子x+y分之5(x-y)—2(x-y)分之x+y的值
x+y=1 5x-2y=8 3x-y=7 2x-y=3x表示y和用y表示x
初一数学题—整式的加减.1.合并同类项(1)x²y+1-3x²y(2)(7x-3z)-(8y-5z)(3)x+[(3x+1)-(4-x)](4)(x²-y²)-3(2x²-3y²)2.先化简,再求值(1) 3(x-1)-(x-5),其中x=2(2) 2x²-y²+(2y²-x²)-(x²-2y
把(x-y)看作一个整体,化解:5(x-y)+2(x-y)-4(x-y)= 3(x-y)把(x-y)看作一个整体,化解:5(x-y)+2(x-y)-4(x-y)=3(x-y)²-4(x-y)+7(x-y)-6(x-y)²=