化简0.1(10-X)+0.5(10-Y)+(10-15+X+Y)=9
化简0.1(10-X)+0.5(10-Y)+(10-15+X+Y)=9
解方程组:(0.2x+0.1y)/2- (4x-y)/10=(x-y)/5+ (3x+0.5y)/30 (3x+2y-1
10/x+y+3/x-y=-5 15/x+y-2/x-y=-1(用换元法解此方程组)
解方程组x+y=15 (x+15%x+y+10%y)=17
方程咋解:3(3X-2)=10-0.5(X+3.5) X+5Y=21 9x+2y=15 x-y=3 3x+4y=10 3
方程组x-y=500① x+15%-(y-10%y)=950②
已知/x/+x+y=10,/y/+x-y=12.求x+y的值
已知2x-y=10,求[(x²+y²)-(x-y)²+2y(x-y)]/4y
若(x-2)*2+15y-11=0,求-3(2x-y)-{7x-〔6x+2y-(10x-8y)〕
解方程组 10(x-y)=3(x+y)+15 6(x+y)=4(2x-y)+16
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