9/5*(x+y)=18 2/3*x+3/2*(x+y)=18解二元一次方程组
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4(x-y)-3(x-y)=9 5(x-y)+2(x-y)=11
已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y)
5x=3y,(2x+y)的平方=5x(x+y)+9
3x-2y=9 x-3y=2 x+y=5 x+2y=3 y=x 2x+y=8
3(x+y)-2(x-y)=11 4(x+y)+3(x-y)=9
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
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
(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
19.9x+2y=38 3x+6y=18 20.5x+5y=45 7x+9y=69 219.9x+2y=38 3x+6y=18 20.5x+5y=45 7x+9y=69 21.8x+2y=28 7x+8y=62
17.3x+8y=51 x+6y=27 18.9x+3y=99 4x+7y=95 19.9x+2y=38 3x+6y=18 20.5x+5y=45 7x+9y=69 21.8x+2y=28 7x+8y
先化简再求值(x-y)(x-2y)+(x-2y)(x-3y)-2(x-3y)(x-4y) x=4 y=5
(计算方程组x+y)/2=6-(x-y)/3,6(x+y)-5(x-y)=18
解方程组 3(x+y)-2(x-y)=9,5(x+y)+2(x-y)=-1
解方程组:{3(x+y)-2(x-y)=9,5(x+y)+2(x-y)=-1}
接二元一次4(x+y)-3(x-y)=9;5(x-y)+2(x+y)=11