解一道方程500/(X-25) +5 + 30(X-25)/X=35步骤写清楚,不要直接把答案写上
问题描述:
解一道方程500/(X-25) +5 + 30(X-25)/X=35
步骤写清楚,不要直接把答案写上
答
500/(X-25) +5 + 30(X-25)/X=35
500/(X-25) + 30(X-25)/X=30................移项(5移右边)
50/(X-25) + 3(X-25)/X=3......................两边同乘1/10
50x+3(x-25)(x-25)=3x(x-25).....................去分母(最简公分母为x(x-25))
50x+3x^2-150x+1875=3x^2-75x................去括号
-25x=-1875............................................移项、合并同类项
x=75
..
答
当X=0或25时,方程无解。
当X 当0
综上所述,方程解为75。
答
500/(X-25) +5 + 30(X-25)/X=35
500/(x-25)+30(x-25)/x=30
50/(x-25)+3(x-25)/x=3
50x+3(x-25)²=3x(x-25)
50x+3x²-150x+1875=3x²-75x
3x²+50x-150x+75x-3x²=-1875
-25x=1875
x=75