1 0.4×125×25×0.8
=（0.4×25）×（125×0.8)
=10×100=1000
2 1.25×（8+10）
=1.25×8+1.25×10
=10+12.5=22.5
3 9123-（123+8.8）
=9123-123-8.8
=9000-8.8
=8991.2
4 1.24×8.3+8.3×1.76
=8.3×（1.24+1.76)
=8.3×3=24.9
5 9999×1001
=9999×（1000+1）
=9999×1000+9999×1
=10008999
6 14.8×6.3-6.3×6.5＋8.3×3.7
=（14.8-6.5）×6.3＋8.3×3.7
=8.3×6.3+8.3×3.7
7 8.3×（6.3＋3.7）
=8.3×10
=83
8 1.24+0.78+8.76
=（1.24+8.76）+0.78
=10+0.78
=10.78
9 933-157-43
=933-（157+43）
=933-200
=733
10 4821-998
=4821-1000+2
=3823
11 32×125×25
=4×8×125×25
=（4×25）×（8×125）
=100×1000
=100000
12 9048÷268
=（2600+2600+2600+1248）÷26
=2600÷26+2600÷26+2600÷26+1248÷269
=100+100+100+48
=348
13 2881÷ 43
=（1290+1591）÷ 434
=1290÷43+1591÷43
=30+37
14 3.2×42.3×3.75-12.5×0.423×16
=3.2×42.3×3.75-1.25×42.3×1.6
=42.3×(3.2×3.75-1.25×1.6)
=42.3×(4×0.8×3.75-1.25×4×0.4)
=42.3×(4×0.4×2×3.75-1.25×4×0.4)
=42.3×(4x0.4x7.5-1.25x4x0.4)
=42.3×[4×0.4×(7.5-1.25)]
=42.3×[4×0.4×6.25]
=42.3×(4×2.5)
=4237
15 1.8+18÷1.5-0.5×0.3
=1.8+12-0.15
=13.8-0.15
=13.65
望采纳
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