13x+15y=43,15x+13y=41
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13x+15y=43,15x+13y=4113x+15y=43,15x+13y=4113x+15y=43,15x+13y=41两式相加可得:28x+28y=84x+y=3把y=3-x代入一式得x=1再
13x+15y=43,15x+13y=41
13x+15y=43,15x+13y=41
13x+15y=43,15x+13y=41
两式相加可得:28x+28y=84 x+y=3
把y=3-x代入一式得x=1 再代入得y=2
2(x+y)-3(x-y)=3 ,4(x+y)+3(x-y)=15
① x+y=13x+2y+5② 3x-7y=15x-4y=17
2x+3y+z=13 4x^2+9y^2+z^2-2x+15y+3z=82 求x,y,z
.m(x-y)²-x+y 5(y-x)²+3(x-y) 15*(a-b)²-3y(b-a) 6(m-n)³-12(n-m)²13/x-4-10/x-3=1/x-1
已知x^2+y^2+13-4x+6y=0,求(2x-y)^2-2(2x-y)(x+2y)+(x+2y)^2
导数的计算练习题导数的计算(1)y=x^5 (2)y=sinx(3)y=1/x^3(4)y=5^√x(5)y=cosx(6)y=5^x(7)y=log3^x(8)y=lnx(9)f(x)=x^3-x^2-x+1(10)y=2x^3-3x^2+4x-1(11)y=x inx(12)y=xsinx-cosx(13)y=cosx/x(14)y=3x(x^2+2)(15)f(x)=(x-1)^2+3(x-1)(16)f(x)=1
x+x+x+x+y=40 x+y= 13x=y=
x=15y
{5x+2y=13,3x-2y=-3,{2x+3y=5,4x-2y=1,{x+y=11,y+z=14,x+z=15,{x+y+z=6,x+z=16,x-y+2z=17解方程,
{5x+2y=13,3x-2y=-3,{2x+3y=5,4x-2y=1,{x+y=11,y+z=14,x+z=15,{x+y+z=6,x+z=16,x-y+2z=17解方程,
解下列方程组(1) ①x-13x+15y=43,②15x+13y=41 (2)①x-8=4(y-8),②x+8=2(y+8)
X+Y=290 4%x+5%y=13
13x+15y=43,15x+13y=41
x^2+y^2=15,x+y=7,x>y,求x-y
x+8y=15 4x+y=29
x+4y=14 x+5y=15
2(x+y)-(x-3y)=13 4(x+y)+3(x-3y)=1解方程组 2(x+y)-(x-3y)=13 4(x+y)+3(x-3y)=1
解方程组 10(x-y)=3(x+y)+15 6(x+y)=4(2x-y)+1610(x-y)=3(x+y)+156(x+y)=4(2x-y)+16