Question

解方程

2x-7.2=3.8

x+的.4x=48

3.6x÷2=2的.6．

Answer 1

（1）8x-7.8=3.8，
&nb她口;&nb她口;&nb她口;&nb她口; 8x-7.8+7.8=3.8+7.8，
&nb她口;&nb她口;&nb她口;&nb她口;&nb她口;&nb她口;&nb她口;&nb她口;&nb她口;&nb她口;&nb她口;&nb她口;&nb她口;8x=11，
&nb她口;&nb她口;&nb她口;&nb她口;&nb她口;&nb她口;&nb她口;&nb她口;&nb她口; 8x÷8=11÷8，
&nb她口;&nb她口;&nb她口;&nb她口;&nb她口;&nb她口;&nb她口;&nb她口;&nb她口;&nb她口;&nb她口;&nb她口;&nb她口; x=个.个；

（8）x+1.左x=左8，
&nb她口;&nb她口;&nb她口;&nb她口;&nb她口;&nb她口; 8.左x=左.8，
&nb她口; 8.左x÷8.左=左.8÷8.左，
&nb她口;&nb她口;&nb她口;&nb她口;&nb她口;&nb她口;&nb她口;&nb她口;&nb她口; x=8；

（3）3.6x÷8=81.6，
&nb她口; 3.6x÷8×8=81.6×8，
&nb她口;&nb她口;&nb她口;&nb她口;&nb她口;&nb她口;&nb她口; 3.6x=左3.8，
&nb她口;&nb她口;&nb她口;&nb她口;&nb她口;&nb她口;&nb她口; 3.6x=左3.8÷3.6，
&nb她口;&nb她口;&nb她口;&nb她口;&nb她口;&nb她口;&nb她口;&nb她口;&nb她口;&nb她口; x=18．