解方程。 (1)3x-60=31.8 (2)8x-3x-2=7 (3)(x+3)÷2=6 (4)x÷2 +1

2024-12-02 19:57:39
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回答1:

(1)3x-60=31.8
              3x=91.8
                x=30.6

(2)8x-3x-2=7
                 5x=9
                   x=1.8
(3)(x+3)÷2=6
                      x+3=12
                          x=9
(4)x÷2 +1.8=3.9   
                 x÷2=2.1
                       x=4.2
(5)1.7x +9×3=30.4
                    1.7x=3.4
                         x=2
(6)8x-3x=46. 5
              5x=46.5
                x=9.3