Question

求未知数x．15×23-120%x=435x+25%×8=29

求未知数x．15×23-120%x=435x+25%×8=29．

Answer 1

①15×

2

3

-120%x=4
         10-1.2x=4
    10+1.2x-1.2x=4+1.2x
        4-4+1.2x=10-4
            1.2x=6
       1.2x÷1.2=6÷1.2
               x=5

②

3

5

x+25%×8=29
   0.6x+2-2=29-2
  0.6x÷0.6=27÷0.6
          x=45