数学问题，小学，能简算要简算

1. 45+32+54 2. 546+785-146 3. 25x49x4 4. 8x（36x125） 5. 0.7+3.9+4.3+6.1
6. 8x4x12.5x0.25 7. 2.7x4.8+2.7x5.2 8. 905x99+905 9. 13x10.2
列式计算哦，能简算要简算·

1. 45+32+54
=(45+54+1)+31
=100+31
=131
2. 546+785-146
=(546-146)+785
=400+785
=1185

3. 25x49x4
=25×4×49
=100×49
=4900

4. 8x（36x125）
=8×125×36
=1000×36
=36000

5. 0.7+3.9+4.3+6.1
=（0.7+4.3）+（3.9+6.1）
=5+10
=15

6. 8x4x12.5x0.25
=（4×0.25）×（12.5×8）
=1×100
=100

7. 2.7x4.8+2.7x5.2
=2.7×（4.8+5.2）
=2.7×10
=27

8. 905x99+905
=905×（99+1）
=905×100
=90500

9. 13x10.2
=13×（10+0.2）
=13×10+13×0.2
=130+2.6
=132.6

2006*(1-1/2)*(1-1/3)*....*(1-1/2006)

=2006*1/2*2/3*3/4*...*2005/2006

=2006*(1/2*2/3*3/4*...*2005/2006)

=2006*1/2006

=1

1.45+32+54=45+55+32-1=131 2.546+785-146=546-146+785=1185 3.25x49x4=25x4x49=490 4.8x（36x125）=（8x125）x36=36000 5.0.7+3.9+4.3+6.1=（0.7+4.3）+（3.9+6.1）=15 6. 8x4x12.5x0.25 =（8x12.5）x（4x0.25）=100 7. 2.7x4.8+2.7x5.2=2.7x（4.8+5.2）=27 8. 905x99+905 =905x（99+1）=90500 9.13x10.2=13x10+13x0.2=132.6

1. 45+32+54 =(45+54+1)+31 =100+31 =131 2. 546+785-146 =(546-146)+785 =400+785 =1185 3. 25x49x4 =25×4×49 =100×49 =4900 4. 8x（36x125） =8×125×36 =1000×36 =36000 5. 0.7+3.9+4.3+6.1 =（0.7+4.3）+（3.9+6.1） =5+10 =15 6. 8x4x12.5x0.25 =（4×0.25）×（12.5×8） =1×100 =100 7. 2.7x4.8+2.7x5.2 =2.7×（4.8+5.2） =2.7×10 =27 8. 905x99+905 =905×（99+1） =905×100 =90500 9. 13x10.2 =13×（10+0.2） =13×10+13×0.2 =130+2.6 =132.6

可以这样 1. 45+32+54 =(45+54+1)+31 =100+31 =131 2. 546+785-146 =(546-146)+785 =400+785 =1185 3. 25x49x4 =25×4×49 =100×49 =4900 4. 8x（36x125） =8×125×36 =1000×36 =36000 5. 0.7+3.9+4.3+6.1 =（0.7+4.3）+（3.9+6.1） =5+10 =15 6. 8x4x12.5x0.25 =（4×0.25）×（12.5×8） =1×100 =100 7. 2.7x4.8+2.7x5.2 =2.7×（4.8+5.2） =2.7×10 =27 8. 905x99+905 =905×（99+1） =905×100 =90500 9. 13x10.2 =13×（10+0.2） =13×10+13×0.2 =130+2.6 =132.6