求未知数X．x-0.25=146.5：x=3.25：40.751.5=x6．

Question

求未知数X．
x-0.25=(1)/(4)
6.5：x=3.25：4
(0.75)/(1.5)=(x)/(6)．

Answer 1

（1）x-0.25=(1)/(4)
   x-0.25+0.25=(1)/(4)+0.25
             x=0.5；

（2）6.5：x=3.25：4
      3.25x=6.5×4
3.25x÷3.25=6.5×4÷3.25
          x=8；

（3）(0.75)/(1.5)=(x)/(6)
     1.5x=0.75.5×6
1.5x÷1.5=0.75×6÷1.5
        x=3．