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624减298的简便方法

624-298=624-(300-2)=624-300+2=324+2=326

624-298=624-(300-2)=624-300+2=324+2=326

624-298=624-(300-2)=624-300+2=324+2=326

=624-(300一2)=624-300+2=324+2=326

624-298=300+324-298=300-298+324=2+324=326

624*78=(600+24)*(100-22)=60000+2400-13200-528=62400-13728=48672 .

624变成622,298变成300

1/2+1/4+1/8+1/16+.+1/128+1/256 =(1-1/2)+(1/2-1/4)+(1/4-1/8)+(1/8-1/16)+.+(1/64-1/128)+(1/128-1/256) =255/256

2079减298的简便方法将298变成300-2即有2079-298=2079-(300-2)=2079-300+2=1779+2=1781

365-298=365-300+2=65+2=67

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