①x=9+6y 3x-7y38 ②3x-4y=8 x+4y=4 ③3x+7y=23 4x-3y=6 ④2x-1=y+2/3 y-1/2=y-x ⑤x+y=1 y+z=2 z+x=3全是方程组,希望帮我解下!

①x=9+6y 3x-7y38 ②3x-4y=8 x+4y=4 ③3x+7y=23 4x-3y=6 ④2x-1=y+2/3 y-1/2=y-x ⑤x+y=1 y+z=2 z+x=3全是方程组,希望帮我解下! 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 ①7x-3y=1,②-5x+6y,方程组①7x-3y=1,②-5x+6y求x,y 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 用递归法求y=x-(x*x*x/3!)+(x*x*x*x*x/5!)-(x*x*x*x*x*x*x/7!)+. 3(x+y)的平方-7(x-y)-9(x+y)的平方-6(x-y) 计算(x-y)^7÷(y-x)^6+9-x-y)^3÷(x+y)^2 若(x-y)/(x+y)=3 则(x+2y)/(6x-7y)等于 1.计算①(x-1-x+1分之8)×x+3分之x+1；②x+3y分之x-y÷x²+6xy+9y²分之x²-y²-x+y分之2y；③（x-x+1分之2x）÷x²-1分之x²-2x+1④（x²-2x分之x+2-x²-4x+4分之x-1）÷x³-2x²分之x-4 2X-9 2X^2-3X+7①Y= ______ ②Y= __________ ③ X(3-X)≤X(X+2)-12X+5 2X^2-3X+12X-9 2X^2-3X+7①Y= ______ ②Y= __________ ③ X(3-X)≤X(X+2)-12X+5 2X^2-3X+1 解方程组x+y/6+x-y/10=3,x+y/6+y-x/10=-1x+y/6+x-y/10=3 ①x+y/6+y-x/10=-1 ② 若2x-3y+4=0则x（x*x-1)+x(5-x*x)-6y+7 7x-6y=3 3x+6y=9 x= y= 3x+5y-(x+y)=6 2(x+y)-3x=-7 ①｛2X-5y=21,②｛2x+y=6,③｛x-3y=1,④｛y=-2x=3 ｛y=-x.｛y=1/2x+1.｛5x-9y=-13.｛y=3x-7 填九宫格帮帮忙.x x 6 x x 7 x x 98 x x x 3 x 1 x x 9 x x 6 x 5 x 3 x x x 3 x x x x 1 8x x x 9 x 1 x x x2 1 x x x x 6 x x x 6 x 7 x 3 x x 1 x x 9 x 2 x x x 47 x x 8 x x 5 x x 已知：2x+y=6,x-3y=1 求7y(x-3y)(x-3y)-2(3y-x)(3y-x) ①(x²-6x+6)/(x²-1)▪(x²+x)/(x-3)②（xy-x²）÷(x-y)/xy③[(x²-y²)/y]²÷(x²+xy)³▪[xy/(y-x)]²④[(x²+2x-3)/(9-x²)]³▪[-(x-3)/(1-x)]²