{x+y=95
{x+y=95
{2x(1-2\3)=y(1-40%)
{2x(1-2\3)=y(1-40%)
其他人气:651 ℃时间:2020-05-12 08:59:50
优质解答
把x+y代入下面的得x=45,y=50要过程。。。ok:y=95-x代入得:2x(1-2/3)=(95-x)(1-40%)化简得:2x×1/3=95×3/5+x×3/52/3×x=57+3/5×x移向得:19/15x=57x=45,代入x+y=95得y=50
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