化简和用简便方法计算

6A+13A=19A;

25.25*0.65*4/0.65=25.25*4=101;

0.93*1.01=0.93*(1+0.1)=0.93+0.093=0.9393;

6.24-3.34-2.66=6.24-(3.34+2.66)=6.24-6=0.24;

8A-(5A+8)=8A-5A-8=3A-8;

0.485*102-48.5=0.485*(100+2)-48.5=48.5+0.97-48.5=0.97;

4.4+4.4*12+1385.6 =4.4*(1+12)+1385.6=4.4*13+1385.6=57.2+1385.6=1442.8;

6X-28-2.5X+30.5=(6-2.5)A+30.5-28=3.5A+2.5;

(5X+7)-(4X+0.18)=5X+7-4X-0.18=X+6.82.

A=3.3,B=30A=99,C=10B=990,D=10C=9900,
D+6C+6B+20A
=9900+990*6+99*6+3.3*20
=9900+5940+594+66
=9900+6600
=16500.

6A+13A=19A

用简便方法计算 25.25*0.65*4/0.65
=(25.25*4)*0.65/0.65
=25.25*4
=(25+0.25)*4
=25*4+0.25*4
=100+1
=101

0.93*1.01=0.93*(1+0.01)=0.93*1+0.93*0.01=0.93+0.0093=0.9393

6.24-3.34-2.66=6.24-(3.34+2.66)=6.24-6=0.24

8A-(5A+8)=8A-5A-8=3A-8

0.485*102-48.5
=0.485*(100+2)-48.5
=0.485*100+0.485*2-48.5
=48.5+0.97-48.5
=0.97

4.4+4.4*12+1385.6
=4.4*(1+12)+1385.6
=4.4*13+1385.6
=57.2+1385.6
=1442.8

6X-28-2.5X+30.5
=(6X-2.5X)+(30.5-28)
=3.5X+2.5

(5X+7)-(4X+0.18)
=5X+7-4X-0.18
=X+6.82

B=30A
C=10B=300A
D=10C=3000A
D+6C+6B+20A
=3000A+1800A+180A+20A
=5000A
=5000*3.3
=16500

19A
先约去0.65/0.65,答案为101
0.93*1+0.93*0.01=0.9393
6.24-3.34-2.66 =6.24-(3.34+2.66)=0.24
8A-(5A+8) =3A-8
0.485*102-48.5=0.485*(102-100)=0.97
4.4+4.4*12+1385.6 =1442.8
6X-28-2.5X+30.5 =3.5X+2.5
(5X+7)-(4X+0.18)=X+6.82

最后一个30分我来啦！
A=3.3 B=3.3*30=99 C=10B=990 D=9900
求9906*996*119*3.3=3874525855.2
但是这题的表述有些不清楚，如果是（d+6）乘（C+6）乘（B+20）乘A就是我上面的答案，如果是d+（6乘C）+（6乘B）+（20乘A）就是下面的答案
B=30A
C=10B=300A
D=10C=3000A
D+6C+6B+20A =3000A+1800A+180A+20A =2000A =5000*3.3 =16500

已修改为补充问题后新版本！！！！！！！

6A+13A:6A+6A+6A+A=3*6A+A=19A(A为具体值时较为方便)
25.25*0.65*4/0.65=25.25*4=(25.0*4+0.25*4)=101
0.93*1.01 =0.93*1.0+0.93*0.01=0.9393
6.24-3.34-2.66 =6.24-(3.34+2.66)=0.24
8A-(5A+8)=3A-8
0.485*102-48.5 =0.485*(102-100)=0.485*2=0.97
4.4+4.4*12+1385.6=4.4+1385.6+4.4*12=1390+4.4*12
=1442.8
6X-28-2.5X+30.5=6X-2.5X+2.5=3.5X+2.5
(5X+7)-(4X+0.18)=X+6.82
下面这道题确实太烦了！
A=3.3 B=30*A=99 C=10*B=300*A=990 D=10*C=3000*A=9900
(D+6)*(C+6)*(B+20)*A
=9906*996*119*3.3=3874525855.2

19A
先约去0.65/0.65,答案为101 这道题一楼错了
0.93*1+0.93*0.01=0.9393
6.24-3.34-2.66 =6.24-(3.34+2.66)=0.24
8A-(5A+8) =3A-8
0.485*102-48.5=0.485*(102-100)=0.97
4.4+4.4*12+1385.6 =1442.8
6X-28-2.5X+30.5 =3.5X+2.5
(5X+7)-(4X+0.18)=X+6.82

19A,101,0.9393,0.24,3A+8,0.97,1442.8,3.5X+2.5,X+6.82