Question

解方程：3.6+x=5.4,1.8x减11.2=6.5,3×0.4+4x=2.5,12x减6x=7.8

Answer 1

3.6+x=5.4

x=5.4-3.6

x=1.8

1.8x减11.2=6.5

1.8x=6.5+11.2

x=17.7/1.8

x=9又5/6

3×0.4+4x=2.5,

4x=2.5-1.2

x=1.3/4

x=0.325

12x减6x=7.8

6x=7.8

x=7.8/6

x=1.3