Y={X (-5
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Y={X(-5Y={X(-5Y={X(-5用switch语句:main(){floatx,y;inti;scanf("%f,&x);printf("x=%7.2f\n");i=x/10;if(x>=1
Y={X (-5
Y={X (-5
Y={X (-5
用switch语句:
main()
{
float x,y;
int i;
scanf("%f,&x);
printf("x=%7.2f\n");
i=x/10;
if(x>=10||x-5&&x
（x+y-5)*（x+y-5)+（x-y+3)=0 x*x-y*y
已知:3x-5y=0,求x/y,x-y/y,x-y/x
x+y=5; x^y+y^x=17
已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y)
若(X×X+Y×Y)(X×X+Y×Y-5)=36,则X×X+Y×Y＝
(X-Y)(X+Y)=5 能解么
5x-4y(y-x)=?
y-x=x-5
Y={X (-5
Y={X (-5
2(x-y)=5y,x-y=-5
x+y／y=5／4,则x／y=----------------
x-y / 5y= (y-x)^2 / ( )
已知：4x = 5y,求(x+y) ：y
x*x+2x+y*y-4y+5=0 x= y=
（5x+3y)(3y-5x)-(4x-y)(4y+x)=
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