1( )(-2X+3Y)=9Y^2-4X^22若(a-2b)^2=9,(2a+b)^2=25,求a^2+b^2,ab的值一楼的,我有三题,哪题是2啊?
来源:学生作业帮助网 编辑:作业帮 时间:2024/10/08 19:18:39
xPN0r& T!-H!$b`5[ts23yN8+ WVTBdV ،o.\4\[q[hJS'j~يהyo楿afQYo?hz8uHUw^lPw-t@8EAXYoi$5u掝
3NBk,SفRlk|?I+X#H
3JOIx`
1( )(-2X+3Y)=9Y^2-4X^22若(a-2b)^2=9,(2a+b)^2=25,求a^2+b^2,ab的值一楼的,我有三题,哪题是2啊?
1
( )(-2X+3Y)=9Y^2-4X^2
2
若(a-2b)^2=9,(2a+b)^2=25,求a^2+b^2,ab的值
一楼的,我有三题,哪题是2啊?
1( )(-2X+3Y)=9Y^2-4X^22若(a-2b)^2=9,(2a+b)^2=25,求a^2+b^2,ab的值一楼的,我有三题,哪题是2啊?
1:(2X+3Y)
2:a^2+b^2=34/5 ab=-13/25或77/25
1. ()(-2X+3Y)=9Y^2-4X^2=(3Y-2X)(3Y+2X)
()=3Y+2X
2.(a-2b)^2=9
a^2-4ab+4b^2=9
(2a+b)^2=25
4a^2+4ab+b^2=25
两式相加得:5(a^2+b^2)=25+9=34
a^2+b^2=34/5=6.8
9y=3x-(x-1),4(x+y)-(2x+4)=8y
3(x+y)-2(x-y)=11 4(x+y)+3(x-y)=9
4(x-y)-3(x-y)=9 5(x-y)+2(x-y)=11
{3(x+y)-4(x-y)=4 {x+y/2 + x-y/6=1
x+y+2(-x-y+1)=3(1-y-x)-4-(y+x-1),x+y=?
(x-y)/4+(x+y)/5=1/4 (x+y)/9-(x-y)/3=//2(x-y)/4+(x+y)/5=1/4(x+y)/9-(x-y)/3=//2
解二元一次方程 {3(x+y)-4(x-y)=-9 x+y/2+x-y/6=1
(x-y) (x-2y)+(x+2y) (x-3y)-2(x-3y) (x-4y)=
先化简 再求值 (2x-y)(y+x)-(x-2y)(2y+x)-(-3y+x)^2其(√x+1)+y^2+4=-4y
化简[(3x+4y)^2-(2x+y)(2x-y)+(-x+y)(5x-y)]除以-2y,其中x=-1,y=1
已知x-y=1,求[(x+2y)^2+(2x+y)(x-4y)-3(x+y)(x-y)]除以y的值大神们帮帮忙
已知x-y=1,求[(x+2y)²+(2x+y)(x-4y)-3(x+y)(x-y)]÷y的值
常微分方程的通解dy/dx=(x-y+1)/(x+y-3)y^4=2y^n+y=0y''+6y'+9y=e^(-3x)y''+y'-2y=4e^(2x)
x²/xy-x/y 3x/4x+y - x-2y/4x+y (1-y/y+x)÷x/y²-x²
[(y-2x)(-2x-y)+4(x-2y)平方]/3y,其中x=1,y=-3
[(2x+y)^2+(y+2x)(y-2x)-2y(4x-y)]/4y,其中x=1/2,y=1/3
先化简,再求值:[(x+y)(x-y)-(x-y)^2+2y(x-3y)]/(-4y),其中x=1,y=-2
化简(x+y)+(2x+1/2y)+(3x+2/3y)+(4x+3/4y)+...+(9x+8/9y)=?