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1、1.25×(8+10)=1.25×8+1.25×10=10+12.5=22.5?1.24+0.78+8.76=(1.24+8.76)+0.78=10+0.78=10.78?1/2-(4/5-1/2)=1/2+1/2-4/5=1-4/5=1/5?4800÷25÷4=4800÷(25x4)=4800÷100=4800÷100=48?2/5-(3/8-3/5)=2/5+3/5-3/8=1-3/8=5/8?3/4-(3/7-1/4)=3/4+1/4-3/7=1-3/7=4/7?3.2x0.125x2.5=0.125x8x(0.4x2.5)=1x1=1?0.4×125×25×0.8=(0.4×25)×(125×0.8)=10×100=1000?1.25×(8+10)=1.25×8+1.25×10=10+12.5=22.5?9123-(123+8.8)=9123-123-8.8=9000-8.8=8991.2?1.24×8.3+8.3×1.76=8.3×(1.24+1.76)=8.3×3=24.9?9999×1001=9999×(1000+1)=9999×1000+9999×1=10008999?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=8.3×(6.3+3.7)=8.3×10=83?1.24+0.78+8.76=(1.24+8.76)+0.78=10+0.78=10.78?933-157-43=933-(157+43)=933-200=733?4821-998=4821-1000+2=3823?32×125×25=4×8×125×25=(4×25)×(8×125)=100×1000=100000?1.8+18÷1.5-0.5×0.3=1.8+12-0.15=13.8-0.15=13.65?6.5×8+3.5×8-47=52+28-47=80-47?3.7x2.56-2.3=9.472-2.3=7.172?1.24+0.78+8.76=(1.24+8.76)+0.78=10+0.78=10.78?1/2-(4/5-1/2)=1/2+1/2-4/5=1-4/5=1/5?4800÷25÷4=4800÷(25x4)=4800÷100=4800÷100=48?2/5-(3/8-3/5)=2/5+3/5-3/8=1-3/8=5/8?3/4-(3/7-1/4)=3/4+1/4-3/7=1-3/7=4/7?3.2x0.125x2.5=0.125x8x(0.4x2.5)=1x1=1?0.4×125×25×0.8=(0.4×25)×(125×0.8)=10×100=1000?1.25×(8+10)=1.25×8+1.25×10=10+12.5=22.5?9123-(123+8.8)=9123-123-8.8=9000-8.8=8991.2?1.24×8.3+8.3×1.76=8.3×(1.24+1.76)=8.3×3=24.9?9999×1001=9999×(1000+1)=9999×1000+9999×1=10008999?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=8.3×(6.3+3.7)=8.3×10=83?1.24+0.78+8.76=(1.24+8.76)+0.78=10+0.78=10.78?933-157-43=933-(157+43)=933-200=733?4821-998=4821-1000+2=3823?32×125×25=4×8×125×25=(4×25)×(8×125)=100×1000=100000?1.8+18÷1.5-0.5×0.3=1.8+12-0.15=13.8-0.15=13.65?6.5×8+3.5×8-47=52+28-47=80-47?3.7x2.56-2.3=9.472-2.3=7.172。

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