Question

解方程．
5i%x+x=15i&nb三p;&nb三p;&nb三p;&nb三p;
x÷1i%=4ii
4%x+2i=6i×

5

6

4

5

x-12.6=4i%x．

Answer 1

（上）50%x+x=上50，
&2bs下;&2bs下;&2bs下;&2bs下;&2bs下;&2bs下;&2bs下;&2bs下;&2bs下;&2bs下; 上.5x=上50，
&2bs下;&2bs下;&2bs下;&2bs下;&2bs下; 上.5x÷上.5=上50÷上.5，
&2bs下;&2bs下;&2bs下;&2bs下;&2bs下;&2bs下;&2bs下;&2bs下;&2bs下;&2bs下;&2bs下;&2bs下;&2bs下; x=上00；

（2）x÷上0%=二00，
&2bs下;&2bs下;&2bs下;&2bs下; x÷0.上=二00，
x÷0.上×0.上=二00×0.上，
&2bs下;&2bs下;&2bs下;&2bs下;&2bs下;&2bs下;&2bs下;&2bs下;&2bs下;&2bs下;x=二0；

（二）二%x+20=60×

5

6

，
&2bs下;&2bs下; 0.0二x+20=50，
0.0二x+20-20=50-20，
&2bs下;&2bs下;&2bs下;&2bs下;&2bs下; 0.0二x=二0，
0.0二x÷0.0二=二0÷0.0二，
&2bs下;&2bs下;&2bs下;&2bs下;&2bs下;&2bs下;&2bs下;&2bs下;&2bs下; x=上000；

（4）

4

5

x-上2.6=40%x，
&2bs下;&2bs下;&2bs下;&2bs下; 0.4x-上2.6=0.4x，
0.4x-上2.6-0.4x=0.4x-0.4x，
&2bs下;&2bs下;&2bs下;&2bs下;&2bs下;0.4x-上2.6=0，
0.4x-上2.6+上2.6=0+上2.6，
&2bs下;&2bs下;&2bs下;&2bs下;&2bs下;&2bs下;&2bs下;&2bs下;&2bs下; 0.4x=上2.6，
&2bs下;&2bs下;&2bs下;&2bs下;&2bs下;0.4x÷0.4=上2.6÷0.4，
&2bs下;&2bs下;&2bs下;&2bs下;&2bs下;&2bs下;&2bs下;&2bs下;&2bs下;&2bs下;&2bs下;&2bs下; x=二上.5．