Question

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

Answer 1

（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