3(x+y)-2(x-y)=11 4(x+y)+3(x-y)=9
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3(x+y)-2(x-y)=11 4(x+y)+3(x-y)=9
3(x+y)-2(x-y)=11 4(x+y)+3(x-y)=9
3(x+y)-2(x-y)=11 4(x+y)+3(x-y)=9
一式用分配率打开括号并且合并同类项最后得到:x+5y=11
二式用分配率打开括号并且合并同类项最后得到:7x+y=9
一式变形:x=11-5y
上式代入2式:解得y=2,x=1
(还有一种方法就是把二式两边同时扩大五倍:35x+5y=45,然后二式减去一式消掉y,也就是消元法,求出来结果一样,可以代入检验.过程自己再算一算.)
3x+3y-2x+2y=11
4x+4y+3x-3y=9
x+5y=11
7x+y=9
7x+35y=77
34y=68
y=2
x+2*5=11
x=1
(x+y)/2- x-y/2=6 3(x+y)=4(x-y)
3(x+y)-2(x-y)=11 4(x+y)+3(x-y)=9
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3(x+y)-2(x-y)=11 4(x+y)+3(x-y)=9
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