X/(X+100)=30%求x多少

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X/(X+100)=30%求x多少X/(X+100)=30%求x多少X/(X+100)=30%求x多少两边乘x+100x=0.3(x+100)x=0.3x+30x-0.3x=300.7x=30x=30

X/(X+100)=30%求x多少
X/(X+100)=30%求x多少

X/(X+100)=30%求x多少
两边乘x+100
x=0.3(x+100)
x=0.3x+30
x-0.3x=30
0.7x=30
x=300/7

x=300/7