100x+10x+y=9(10x+y) 化简
X+Y=7(100X+Y)-(10Y+X)=(10Y+X)-(10X+Y)
已知/x/+x+y=10,/y/+x-y=12.求x+y的值
解方程组:2/(x+y)+5/(x-y)=18 9/(x+y)-10/(y-x)=66
解方程组:2/(x+y)+5/(x-y)=18 9/(x+y)-10/(y-x)=66
解方程组 2x+y(y-2x)=9 (x+y)(x+y-3)=10
已知实数x,y满足|x|+x+y=10、x+|y|-y=12,则x+y的值?
已知2x-y=10,求[(x²+y²)-(x-y)²+2y(x-y)]/4y
由题意:(10Y+X)-(10X+Y)=(100X+Y)-(10Y+X) Y=6X 怎么算的啊 发一些详细的
x²-2x+y²+6y+10=0,求—9(x+y)²+(3x-2y)(2y+3x)的值
已知四位数2x9y=2^x*2^y,(2^x9^y表示2*1000+x*100+9*10+y)试确定2^x9^y-x(x
y=(x-1)(x-2)(x-3)(x-4)(x-5)(x-6)(x-7)(x-8)(x-9)(x-10)的导数在x=1
二元一次方程:{3X=2Y,3X+4Y=36 {3X+4Y=10,4X+Y=9 {2X-Y=6,X+2Y=-2 {X+Y