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 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 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 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

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）

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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

收起

出点有难度的……

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）
=8×125×3...

全部展开

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

收起

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（4...

全部展开

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

收起