数学题 5x+2y=5a① 3x+4y=3a②

数学题 5x+2y=5a① 3x+4y=3a② 几道 数学题急啊 对了再加20分(x+y)^2-(x+y)^3(x-y)^2-(x-y)^3 (x-y)^2-(y-x)^32(x-y)-3(y-x)^24ab(a+b)^2-6a^2b(a+b)(x+y)(x-y)-(x+y)^28a(x-y)^2-4b(y-x)a=-5 a+b+c=-5.2求代数式a^2(-b-c)-3.2a(c+b)的值 方程组数学题已知关于x,y的方程组x-y=a+3,2x+y=5的解满足x>y>0,化简|a|+|3-a|. 数学题集合A={y丨y=x平方-2x+3} B={y丨y=-x平方+5x+6} 求A∩B 一道二次根式的数学题若x、y均为实数,且满足等式,(√3x+5y-2)+(√2x+4y-a)=(√x-199+y)*(√199-x-y),求a详细过程 数学题……555{(3x+y)(3x-y)-(x-5y)(5x-y)-(x-2y)²÷(-4x),x=-2.y=-1 数学题--已知x+1/2=y+3/4=x+y/5,则3x+2y+1/2x-y+3=? 问一条数学题：已知实数x、y满足√(2x-3y-1) + |x-2y+2|=0,求2x- 4/5y的值 一道数学题.如果(x+y):(x-y)=5:2,那么x:y= 数学题,2元一次方程组,消元法解!①｛x+y=5, 2x-y=1. ②｛5x-6y=15, 5x+y=3. ③｛a+5b=6 3a-6b=4 ④｛3x+4y=16 5x-6y=33 (x-2y)^5=a0(x+2y)^5+a1(x+2y)^4*y+a2(x+2y)^3*y^2+a3(x+2y)^2*y^3+a4(x+2y)y^4+a 数学题5/12x-x/4=1/3-x 2/3-8y=3-1/2(y-1) 几道分式数学题 解方程组 (X-1)/(X+5)=(Y-6)/(Y+2)(X-3)/X-(Y-4)/(Y-1)=0解方程组 (X+Y)/3-3/(X-Y)=1/6(X+2)+2/(X-Y)=3若方程(X-5)/(X-6)-(X-6)/(X-5)=K/(X的平方-11X+30)的解不大于13,求K的取值范围A为何值时,关于X的方程2/( 3(x+y)+2(x-y)=36 4(x+y)-5(x-y)=2 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 很多很多数学题都是求x,y的1.2x-y=5 3x+4y=22.5x-y=110 9y-x=1103.8x+3y=7 5x-3y=6 4x+3y=6x-y=-25.4x-5y=1 2x-y=56.4x+3y=6 5x+6y=3 数学题{3X-2Y=10 5X+3Y=80