x 1 3 5 7 9 y 1 5 9 13 17 求这个函数的表达式,怎么求

帮忙解一些方程组(1)3x-2y=6 2x+3y=17 (2)5x+6y=15.2 3x-2y=-0.4(3)2(x+y)-3y=7 4(x-9)=3(y-2)(4)3(x+y)-4(x-y)=4 x+y/2+x-y/6=1 x+y=3 x+2y=9 3/x+1=y y-x=3 y=2x-3 y-3x=1 2(x+1)-y=6 7x-5y=-9用代入法解 x+y=3 x+2y=9 3/x+1=y y-x=3 y-x=3 y=2x-3 y-3x=1 2(x+1)-y=6 7x-5y=-9 y-x=3 (x-y)/4+(x+y)/5=1/4 (x+y)/9-(x-y)/3=//2(x-y)/4+(x+y)/5=1/4(x+y)/9-(x-y)/3=//2 1 x²y-3xy²2 2x(2x-y)+y(y-2x)3 -6x(m-2n)+12(2n-m)4 3(y-x)²-(x-y)³5 4a²-366 (x-2y)²-x²7 4x³y+4x²y²+xy³8 (x+y)²-2m(x+y)+m²9 x²-9x+1810 -8x²-10x-3 x+y=5① x=3y+2① 9x-5y=1① 3x-2y=11① x-2y=y+1① 2x-y=7② x+3y=8② 6x-7y=2② 2x+3y=16② 2x-3y=10②3x+2y=y+1①2x-3y=10②D 求解(1){2x-y=9 3x+y=7 (2)｛4x-3y=5.6 5x+3y=7.4 (3)｛2x+3y+19=0 x+5y-1=0(4)｛x+y/2+x-y=1 4（x+y)-5(x-y)=2 解方程组 3(x+y)-2(x-y)=9,5(x+y)+2(x-y)=-1 解方程组:{3(x+y)-2(x-y)=9,5(x+y)+2(x-y)=-1} 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 计算题:9(x-y)^3[-1/9(x-y)^m+5](y-x)^2 2x²+1/2y²-2x-3y+5=0,求(2x√9x-y²√x/y³)-(√1/x-7x√y/x)的值 二元一次分式方程组 （1) 4／x+3／y=10 9/x-7/y=-5 (2) 4/x+y+6/x-y=3 9/x-y-1/x+y=1 2/5x+2/3y=-10 ① x/3-y/9=1 ② 解方程组 x-y/5-x+y/2=-1/10① x-y/7-x+y/6=1/2② (5/2)x+(2/3)y=-10x/3-y/9=1(x-y)/5-(x+y)/2=-1/10(x-y)/7-(x+y)/6=1/2 z+y=3x,3x-9=y-1,5y-5=3x-7 化简 x-[y-2x-(x-y) -9-4[2x-5(x+1)] 2x-3{y-[3x-(2y-x)]-2x}过程一步一步的列好x-[y-2x-(x-y) -9-4[2x-5(x+1)] 2x-3{y-[3x-(2y-x)]-2x} 用代入法解下列方程组 ①｛y=1-x 3x+2y=5 ②｛2x-y=5 3x+4y=2 ③｛x-y-3=0 3x-8y=14 ④｛④｛2x-7y=8 3x-8y-10=0⑤｛x=3y+7/2 x=2y+8/3⑥｛3x=5y 4y-3x+9=0急 求x和y,（1）3x+4y=5 （2）-7x+9y=-6 (3)3x-y=9