发布时间:2019-08-28 21:17:44
原式 = 50X+ (1+50)*50/2 = 50X + 1275 = 1352
50X = 77
X = 77/50 = 1.54
解:原方程变为
50X+(1+50)*50/2=1352
50X+1275=1352
50X=77
X=77/50
50x+50×51/2=1352
50x=1352-1275
50x=77
x=77/50
x=1.54