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1、5.9x9.9+0.59=5.9x9.9+5.9x0.1=5.9x(9.9+0.1)=5.9x10=59或者：5.9x9.9+0.59=0.59x99+0.59x1=0.59x(99+1)=0.59x100=59望采纳！O(∩_∩)O~1.25×(8+10)=1.25×8+1.25×10=10+12.5=22.51.24+0.78+8.76=(1.24+8.76)+0.78=10+0.78=10.781/2-(4/5-1/2)=1/2+1/2-4/5=1-4/5=1/54800÷25÷4=4800÷(25x4)=4800÷100=4800÷100=482/5-(3/8-3/5)=2/5+3/5-3/8=1-3/8=5/83/4-(3/7-1/4)=3/4+1/4-3/7=1-3/7=4/73.2x0.125x2.5=0.125x8x(0.4x2.5)=1x1=10.4×125×25×0.8=(0.4×25)×(125×0.8)=10×100=10001.25×(8+10)=1.25×8+1.25×10=10+12.5=22.59123-(123+8.8)=9123-123-8.8=9000-8.8=8991.21.24×8.3+8.3×1.76=8.3×(1.24+1.76)=8.3×3=24.99999×1001=9999×(1000+1)=9999×1000+9999×1=1000899914.8×6.3-6.3×6.5+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=831.24+0.78+8.76=(1.24+8.76)+0.78=10+0.78=10.78933-157-43=933-(157+43)=933-200=7334821-998=4821-1000+2=382332×125×25=4×8×125×25=(4×25)×(8×125)=100×1000=1000001.8+18÷1.5-0.5×0.3=1.8+12-0.15=13.8-0.15=13.656.5×8+3.5×8-47=52+28-47=80-473.7x2.56-2.3=9.472-2.3=7.1721.24+0.78+8.76=(1.24+8.76)+0.78=10+0.78=10.781/2-(4/5-1/2)=1/2+1/2-4/5=1-4/5=1/54800÷25÷4=4800÷(25x4)=4800÷100=4800÷100=482/5-(3/8-3/5)=2/5+3/5-3/8=1-3/8=5/83/4-(3/7-1/4)=3/4+1/4-3/7=1-3/7=4/73.2x0.125x2.5=0.125x8x(0.4x2.5)=1x1=10.4×125×25×0.8=(0.4×25)×(125×0.8)=10×100=10001.25×(8+10)=1.25×8+1.25×10=10+12.5=22.5 5.9x9.9+0.59=5.9x9.9+5.9x0.1=5.9x(9.9+0.1)=5.9x10=59或者：5.9x9.9+0.59=0.59x99+0.59x1=0.59x(99+1)=0.59x100=59。

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