作业帮{4y=3x-(x-2) 4(x+y)-(x+4)=8y 用代入法解下列方程 {二分之m+三分之n=13, 三分之m-四分之n要详细过程!快{二分之m+三分之n=13, 三分之m-四分之n =3
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{4y=3x-(x-2) 4(x+y)-(x+4)=8y 用代入法解下列方程 {二分之m+三分之n=13, 三分之m-四分之n要详细过程!快{二分之m+三分之n=13, 三分之m-四分之n =3
{4y=3x-(x-2) 4(x+y)-(x+4)=8y 用代入法解下列方程 {二分之m+三分之n=13, 三分之m-四分之n
要详细过程!快
{二分之m+三分之n=13, 三分之m-四分之n =3
{4y=3x-(x-2) 4(x+y)-(x+4)=8y 用代入法解下列方程 {二分之m+三分之n=13, 三分之m-四分之n要详细过程!快{二分之m+三分之n=13, 三分之m-四分之n =3
{4y=3x-(x-2) (1)
4(x+y)-(x+4)=8y (2)
由(1),
得x=2y-1 (3)
(3)代入(2),
得4(3y-1)-(2y+3)=8y
12y-4-2y-3-8y=0
2y-7=0
y=7/2
x=7/2×2-1=6
方程组的解是x=6,y=7/2
{二分之m+三分之n=13,(1)
三分之m-四分之n =3 (2)
(1)×18+(2)×24,
得9m+8m=306
则,m=18
m=18代入(1),
得9+n/3=13
解得n=12
方程组的解是m=18,n=12
(x-y) (x-2y)+(x+2y) (x-3y)-2(x-3y) (x-4y)=
{3(x+y)-4(x-y)=4 {x+y/2 + x-y/6=1
2（x+y)-3(x-y)=3 ,4(x+y)+3(x-y)=15
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
3(x+y)-2(x-y)=11 4(x+y)+3(x-y)=9
3(x+y)+2(x-y)=36 4(x+y)-5(x-y)=2
（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
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
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(x+3y-4)(2x-y)