x+5/3+y+3/2=7 2x-3/5-y-2/3=0 求x,y的值请用二元一次解
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x+5/3+y+3/2=7 2x-3/5-y-2/3=0 求x,y的值请用二元一次解
x+5/3+y+3/2=7 2x-3/5-y-2/3=0 求x,y的值
请用二元一次解
x+5/3+y+3/2=7 2x-3/5-y-2/3=0 求x,y的值请用二元一次解
即2x+10+3y+9=42
2x+3y=23 (1)
6x-9-5y+10=0
6x-5y=-1 (2)
(1)×3-(2)
14y=70
y=5
x=(5y-1)/6=4
2(1-cos^2x)-3cosx=0
2cos^2x+3cosx-2=0
(cosx+2)(2cosx-1)=0
-1<=cosx<=1
所以cosx=1/2
所以x=2kπ-π/3,x=2kπ+π/3
已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y)
3x+5y-(x+y)=6 2(x+y)-3x=-7
若2x-3y+4=0则x(x*x-1)+x(5-x*x)-6y+7
x+y=1 5x-2y=8 3x-y=7 2x-y=3x表示y和用y表示x
x+y/2+x-y/6=5 2(x+y)-3(x-y)=-2
(x-y)/(x+y)=3求( 3x-2y-1)/(x+y-5)
3(x+y)+2(x-y)=36 4(x+y)-5(x-y)=2
化简:3(x-y)²-7(x-y)+ 2(x-y)²+5(x-y)
4(x-y)-3(x-y)=9 5(x-y)+2(x-y)=11
3(x+y)-4(x-y)=11,2(x-y)+5(x+y)=27
6(x-y)-2(x+y)=14 3(x-y)+(x+y)=5
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)
先化简再求值(x-y)(x-2y)+(x-2y)(x-3y)-2(x-3y)(x-4y) x=4 y=5
化简:5(x-y)+2(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)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=
{(x+y)/2+(x-y)/3=1,(x+y)-5(x-y)=2.求x=?,y=?
(2x+y)²+(x+3y)(x-3y)-x(5x+8y)因式分解
已知7x+5y/2y-x=3/2,且x≠0,求X/x-4y