题目内容

解方程
(1)1.56x+3.16 =7.84     (2)7.6x+2x+0.72 =18     (3)5.8 ×4.5 +0.4x =29.1
(4)x +0.7x+0.96 =3 (5)3.9x +9.36 =13.65 (6)(x-3)÷4=7.2
(1)1.56x+3.16 =7.84  
                  1.56x=4.68
                        x=3
(2)7.6x+2x+0.72 =18 
                        9.6x=17.28
                            x=1.8
(3)5.8 ×4.5 +0.4x =29.1
                         0.4x=3
                              x=7.5
(4)x +0.7x+0.96 =3
                      1.7x=2.04
                          x=1.2
(5)3.9x +9.36 =13.65
                   3.9x=4.29
                       x=1.1
(6)(x-3)÷4=7.2
                     x-3=28.8
                        x=31.8
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