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1、0.92x15+0.08x15=(0.92+0.08)×15=1×15=150.72×1.25×2.5=0.9×(0.8×1.25)×2.5=0.9×1×2.5=2.2560×(1/12+1/15+1/4)=60×1/12+60×1/15+60×1/4=5+4+15=24(5/12-3/8)×72=5/12×72-3/8×72=30-27=36/7-5/24÷7/12=6/7-5/24×12/7=12/14-5/14=7/14=1/2[3/4×(7/16-1/4)]÷9/13=3/4×（7/16-4/16）×13/9=1/4×3/16×13/3=13/642/3-7/8+1/3=(2/3+1/3)-7/8=1-7/8=1/85/6-(3/7-1/6)=(5/6+1/6)-3/7=1-3/7=4/71-1/3-2/3=1-(1/3+2/3)=1-1=01+3/5-1/10=1+6/10-1/10=1+1/2=1又1/23/8-12/13+5/8=3/8+5/8-12/13=1-12/13=1/131-(1/2-3/4)=1+3/4-2/4=1+1/4=5/41-1/2-1/4=1/2-1/4=2/4-1/4=1/42/7-8/9+5/7=(2/7+5/7)-8/9=1-8/9=1/92-1/4-3/4=2-(1/4+3/4)=2-1=11/2-(3/8-1/2)=1/2+1/2-3/4=1-3/8=5/87×25/26=7x(1-1/26)=7x1-7x1/26=7-7/26=6又19/2618又9/10×1/9=(18+9/10)x1/9=18x1/9+9/10x1/9=2+1/10=2又1/1021又1/19×1/20=(20+20/19)x1/20=20x1/20+20/19x1/20=1+1/19=1又1/19(25+2又5/21)×21/26=(26+26/21)x21/26=26x21/26+26/21x21/26=21+1=226/11×3/7+4/11×6/7=6/11x3/7+6/11x4/7=6/11x(3/7+4/7)=6/11x1=6/112.64×1.7-2.64×0.7=2.64×(1.7-0.7)=2.64×1=2.6431.5×1.07-3.15×0.7=3.15×10.7-3.15×0.7=3.15×(10.7-0.7)=3.15×10=31.52.7×5.7-2.7+5.3×2.7=2.7×(5.7-1+5.3)=2.7×10=270.625÷0.125×0.8=(0.625×0.8)×8÷(0.125×8)=0.5×8÷1=418.6×6.1+3.9×18.6=18.6×(6.1+3.9)=18.6×10=18652.5x2.9+5.45=5.25x29+5.25+0.2=5.25×(29+1)+0.2=5.25×30+0.2=157.5+0.3=157.70.92x15+0.08x15=(0.92+0.08)×15=1×15=150.72×1.25×2.5=0.9×(0.8×1.25)×2.5=0.9×1×2.5=2.25400.6x7-2003x0.4=200.3x14-200.3x4=200.3×（14-4）=200.3×10=2003300÷125÷8=300÷(125×8)=300÷1000=0.3396-96-172-28=(396-96)-(172+28)=300-200=100125x24=125x8x3=1000x3=300026x15=(20+6)x15=20x15+6x15=300+90=39025x99x4=25x4x99=100x99=9900250x32=250x4x8=1000x8=8000(98+98+98+98)x25=4x98x25=4x25x98=100x98=98003/4÷5/8×3/10=3/4×8/5×3/10=9/5×1/5=9/251.25×(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=1/52/5-(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=10009123-(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=1000001.24+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=10009123-(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=80-47=333.7x2.56-2.3=9.472-2.3=7.172(25+2又5/21)×21/26=(26+26/21)x21/26=26x21/26+26/21x21/26=21+1=226/11×3/7+4/11×6/7=6/11x3/7+6/11x4/7=6/11x(3/7+4/7)=6/11x1=6/11。

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