3n+m=6,3m-2n=28 n,m的多少
3n+m=6①
3m-2n=28②
①×3-②
9n+3m-3m+2n=6×3-28
11n=-10
n=-10/11
代入①
3×(-10/11)+m=6
m=36/11
題目寫(xiě)清楚再幫你改修改的題目 ok了在幫看一下吧(x+y)/3+(x-y)/2=6 3(x+y)-2(x-y)=28令x+y=m,x-y=n 原方程可寫(xiě)為m/3+n/2=6,3m-2n=28m/3+n/2=6①3m-2n=28②①×63n+2m=36③【你錯(cuò)在這一步了,等號(hào)右邊也要×63n+2m=36③3m-2n=28②③×3-②×29n+6m-6m+4n=36×3-28×213n=52n=4代入②3m-2×4=28m=12∴x+y=12④x-y=4⑤④+⑤2x=16x=8代入⑤8-y=4y=4OK~
3n+=6,3m-2n=28 n,m的多少
3n+=6,3m-2n=28 n,m的多少
x+y/3+x-y/2=6(1) 3(x+y)-2(x-y)=28(2) {{ 令x+y=m,x-y=n 原方程可寫(xiě)為3n+2m=6,3m-2n=28 }} 求xy值
x+y/3+x-y/2=6(1) 3(x+y)-2(x-y)=28(2) {{ 令x+y=m,x-y=n 原方程可寫(xiě)為3n+2m=6,3m-2n=28 }} 求xy值
數(shù)學(xué)人氣:647 ℃時(shí)間:2020-07-10 07:48:58
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