數學問題,小學,能簡算要簡算

2021-05-18 11:27:50 字數 1729 閱讀 7027

1樓:匿名使用者

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

=156. 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

=278. 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

2樓:一毛不拔的鐵公雞

可以這樣

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

=156. 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

=278. 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

3樓:明天的夢想

1.45+32+54=45+55+32-1=1312.546+785-146=546-146+785=11853.

25x49x4=25x4x49=4904.8x(36x125)=(8x125)x36=360005.0.

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)=905009.13x10.2=13x10+13x0.2=132.6

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