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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