3x+6y=20 6x-3y=16 x=? y=?这道题有没有解法? 如没有,请加上相关条件.
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3x+6y=20 6x-3y=16 x=? y=?这道题有没有解法? 如没有,请加上相关条件.
3x+6y=20 6x-3y=16 x=? y=?
这道题有没有解法? 如没有,请加上相关条件.
3x+6y=20 6x-3y=16 x=? y=?这道题有没有解法? 如没有,请加上相关条件.
3x+6y=20
两边同时乘以2得:6x+12y=40
又因为6x-3y=16
相减得:15y=24
y=8/5
x=14/5
3x+6y=20----------(1)
6x-3y=16 (12x-6y=32)---------(2)
(1)+(2):
15x=52 x=52/15
y=(20-52/5)/6
=8/5
x+y/2+x-y/3=6,4(x+y)-3(x-y)=-20
{(x+y)/2+(x-y)/3=6 4(x+y)-3(x-y)=-20
4(x+y)-3(x-y)=-20,2/x+y+3/x-y=6
【2(x-y)^3-8(x-y)^2(x+y)+6y(x-y)^2】/2(x-y)^2=
2(x+y)-3(x-y)=1 6(x+y)+(x-y)=51
{3(x+y)-4(x-y)=4 {x+y/2 + x-y/6=1
x+y/2+x-y/6=5 2(x+y)-3(x-y)=-2
6(x-y)-2(x+y)=14 3(x-y)+(x+y)=5
(x+y)/2- x-y/2=6 3(x+y)=4(x-y)
x+y/3+x-y/2=6 4(x+y)-2(x-y)=40
若(x-y)/(x+y)=3 则(x+2y)/(6x-7y)等于
6(x+y)的平方-11(x+y)(x-y)+3(x-y)的平方=?
x+y/2+ x-y/2=6 2(x+y)-3x+3y=24 求X Y
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
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分开的。
8x-8y-3x-3y=-12,6x+6y-8x+4y=16
解方程组;x+y/2=x-y/3=6 4(x+y)-3(x-y)=-20
2元一次方程组 2/x+y+3/x-y=6 4(x+y)-3(x-y)=-20