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求未知數x的值。(帶*的要驗算)
(1)3x+2.4x= *
        驗算:
(2)0.8x-28.7=11.3 *
        驗算:
(3)(x-5)=75% (4)6(0.6+x)= 4
(5)36:72=14:x (6)5.6:x=3.6:1.8
(7)x:20%=2: (8)2.4:1.6=3.6:x
(9)= (10)1.4:1=1:x
(1)3x+2.4x= 
                  6.2x=
                       x=
驗算:3×+2.4×=

(2)0.8x-28.7=11.3 
                 0.8x=40
                      x=5
  
   
驗算:0.8×5-28.7=113

(3)(x-5)=75%
             x-=
                  x=
                      x=11

(4)6(0.6+x)= 4
                3.6+6x= 4.5
                       6x=0.9
                         x=0.15
(5)36:72=14:x
              36x=14×72
                  x=28
(6)5.6:x=3.6:1.8
             3.6x=1.8×5.6
                  x=2.8
(7)x:20%=2:
              x= 40%
                  x=
(8)2.4:1.6=3.6:x
                2.4x=3.6×1.6
                    x=2.4
  
(9)=
         2.4x=7.5×25
             x=
(10)1.4:1=1:x
                  1.4x=1
                      x=
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