题目内容

解方程。
(1)4.5×6+4x= 41 (2)2x+1.5x= 42
(3)(x-4.5)×6=31.8 (4)27-17x=13.4
(5)(x+1.7)÷3=1.4 (6)5x+4x=3x+18
(7)4:=x:6.5 (8)0.3x+7x-0.25x-1.15=20

(1)4.5×6+4x= 41
               27+4x= 41
                     4x=14
                       x=3.5

(2)2x+1.5x= 42
               3.5x=42
                   x=12
  
(3)(x-4.5)×6=31.8
                     6x-27=31.8
                          6x=58.8
                            x=9.8
(4)27-17x=13.4
              17x=27-13.4
                  x=0.8
    
(5)(x+1.7)÷3=1.4
                     x+1.7=4.2
                           x=2.5
(6)5x+4x=3x+18
               6x=18
                 x=3
(7)4:=x:6.5
             x=27
                   x=2.4
(8)0.3x+7x-0.25x-1.15=20
                              7.05x=21.15
                                     x=3
  
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