小学数学，脱式计算。要全过程，不要直接答案！谢谢啊！

4.05÷0.5+10.75
=8.1+10.75
=18.85

21.6÷0.8-1.2×5
=27-6=21

8.4×6.9÷(6.44-4.14)
=8.4×6.9÷2.3
=8.4×3
=25.12

0.38×102

=0.38×100+0.38×2
=38+0.76
=38.76

（1）4.05÷0.5+10.75
=（4+0.05）÷0.5+10.75
=8+0.1+10.75
=18.85
（2）21.6/0.8-1.2*5
=216/8-6
=27-6
=21
（3）8.4*6.9/(6.44-4.14)
=8.4*6.9/2.3
=8.4*3
=25.2
（4）0.38*102
=0.38*（100+2）
=0.38*100+0.38*2
=38+0.76
=38.76

您好4.05/0.5+10.75=4.05*2+10.75=8.1+10.75=18.85
21.6/0.8-1.2*5=21.6*5/4-1.2*5=(21.6/4-1.2)*5=21
8.4*6.9/(6.44-4.14)=8.4*(6.9/2.3)=25.2
0.38*102=0.38*2+0.38*100=38.76