作业帮{2x+3y=12① ,3x+4y=17②
来源：学生作业帮助网 编辑：作业帮 时间：2024/11/17 06:29:13
xQN@>Le1-߁4&YʒEb"F-~ [xB$h2ssH'O(3$th):ؤ6?X-4&R (',E`$E <<]qu\A*jA -*>JGuIn2C;N &>~^fLo|6~sйk3Këy;rt\{?joq c,
u'󠇐T~ۻq&8tBT@W1#.*@PZ|nM,p2C}ƪCŨVmoĻ̡:^gS xgx1ب"wf?^^<tWk}1Ƨ4Qrw -NL@:
{2x+3y=12① ,3x+4y=17②
{2x+3y=12① ,3x+4y=17②
{2x+3y=12① ,3x+4y=17②
1式X3得 6x+9y=36为三式
2式X2得 6x+8y=34为四式
三式减四式得y=2
把y=2带入1式 得x=3
将1式的x转化为x＝12－3y/2，再把x代入2式求出y即可
你好，
2x+3y=12①
3x+4y=17②
令4*①-3*②:8x-9x=12*4-17*3=-3=-x
所以x=3,同样y=2
所以x=3,y=2
谢谢~
1式乘以2分之3再减去2事得0.5Y=1故可得解
把1扩大3倍，2扩大2倍
然后用1的式子减去2
得出y的值
然后代入求X
(x-y) (x-2y)+(x+2y) (x-3y)-2(x-3y) (x-4y)=
已知2x-y/x+3y=2,求代数式4x-2y/x+3y减4x+12y除以2x-y
已知2x-y/x+3y=2,求代数式4x-2y/x+3y减4x+12y/2x-y的值
已知2x-y/x+3y=2,求代数式4x-2y/x+3y减4x+12y/2x-y的值
12y(x-y)^2-8(x-y)^3=?
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)-4(x-y)=4 {x+y/2 + x-y/6=1
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
把(x-y)看作一个整体,化解:5(x-y)+2(x-y)-4(x-y)= 3(x-y)把(x-y)看作一个整体,化解:5(x-y)+2(x-y)-4(x-y)=3(x-y)²-4(x-y)+7(x-y)-6(x-y)²=
先化简再求值(x-y)(x-2y)+(x-2y)(x-3y)-2(x-3y)(x-4y) x=4 y=5