x+2y+3x=15,x-y+7x=20,x+3y+2z=14改下 是x+2y+3z=15,x-y+7z=20,x+3y+2z=14
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x+2y+3x=15,x-y+7x=20,x+3y+2z=14改下是x+2y+3z=15,x-y+7z=20,x+3y+2z=14x+2y+3x=15,x-y+7x=20,x+3y+2z=14改下是x
x+2y+3x=15,x-y+7x=20,x+3y+2z=14改下 是x+2y+3z=15,x-y+7z=20,x+3y+2z=14
x+2y+3x=15,x-y+7x=20,x+3y+2z=14
改下 是x+2y+3z=15,x-y+7z=20,x+3y+2z=14
x+2y+3x=15,x-y+7x=20,x+3y+2z=14改下 是x+2y+3z=15,x-y+7z=20,x+3y+2z=14
题目确定如此,不再更改?
x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2
x^2+y^2=15,x+y=7,x>y,求x-y
2(x+y)-3(x-y)=3 ,4(x+y)+3(x-y)=15
x+y/2+x-y/3=6,4(x+y)-3(x-y)=-20
{(x+y)/2+(x-y)/3=6 4(x+y)-3(x-y)=-20
4(x+y)-3(x-y)=-20,2/x+y+3/x-y=6
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3^x+2x=y,x
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(x-y) (x-2y)+(x+2y) (x-3y)-2(x-3y) (x-4y)=
已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y)
例X=1 y=21.X+Y=5 X-Y=15 2.2X+3Y=4 5X+6Y=7 3.X+3Y=5 3X+Y=-1 4.2X+Y=3 3X+5Y=11 5.4X+3Y=6 2X+Y=4 6.X+Y=180 X=3Y-10 7.3X-2Y=3 2X-Y=7 8.5X+3Y=7Y X+Y=45 9.3X+4Y=126X+8Y=24 X:6Y=1:4 10.X+Y=138 X-45=Y+53 11.X+Y=60 14Y=20X 12.2X+3Y=15.5 5X+6Y=35 13.X+Y=170 3
(x+y)(2x-3y)=?
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3x+5y-(x+y)=6 2(x+y)-3x=-7
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!)+.
若2/x-1/y=3,求[y/x-y/x-y(x-y/x-x+y)]/x-2y/x的值
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