1)已知4X=5y,求(X+y):y 2)已知(a-b):(a+b)=3:7,求a:b
1)已知4X=5y,求(X+y):y 2)已知(a-b):(a+b)=3:7,求a:b
已知|x-y-3|+(a+b+4)²=0,求2a+2b-(a+b)分之(x-y)²-3(y-x)的值
(1)已知a/x+b/y=1(b不等于y),求x; (2)已知K=y-9/x-m(k不等于0),求x.“/...
已知2x-3y=4 2a-3b=4 求过A(x,y ) B (a,b)的直线l的方程?
1.、已知线段x,y,如果(x+y):(x-y)=a:b,求x、y
已知a^x-y*a^2y+1=a^11,且b^x-1*b^4-y=b^5,求(x^2)*y的值
已知集合A={(X,Y)|Y=-X+1},集合B={(X,Y)|Y=X平方-1},求A交B
已知集合A={(x,y)|2x-y=0},B={(x,y)|3x+y=0},C={(x,y)|2x-y=3}求A∩B,A
1.已知集合A={(x,y)|y=2x+1},B={(x,y)|y=x+3},a∈A,b∈B,求a
已知集合A={x|-1≤x≤3) B=(y|x2=y,x属于A) C=(y|y=2x+a,x属于A)若满足c包含于b 求
已知:A=X*X-3xy+y*y,B=2x*x+xy-3y*3y.求A+B,A-B,A+2B
已知集合A={(x,y|2x-y=0)},B={(x,y)|3x+y=0},C={(x,y)|2x-y=3},求A∩B,