作业帮{2x+3y=12① ,3x+4y=17②
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{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)=
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