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·

来源:学生作业帮助网 编辑:作业帮 时间:2024/05/02 08:04:04
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)

全部展开

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