918除以9减91的巧算
918除以9减91的巧算 -
918÷9-91 =102×9÷9-91 =102×1-91 =102-91 =11
先把918分成900和18,900除以18为50,18除以18为1,最后50加1为51,这就是这道题的巧算,
918÷9-91 =102×9÷9-91 =102×1-91 =102-91 =11
先把918分成900和18,900除以18为50,18除以18为1,最后50加1为51,这就是这道题的巧算,
解:18900÷(918-891)18900÷27 =(700x27)÷27 =700x(27÷27)700x1 =700
解:918×111-102×899 =918×111-(102×888+11x102)=918×111-(102×8x111+11x102)=918×111-816×111-11x102 =102x111-11x102 =102x(111-11)-102x100 =10200
巧算: 990\125\8 (918*17+8*18) -
990÷125÷8 =990÷(125x8)990÷1000 =0.99
189+198+891+819+981+918 =200-11+200-2+900-9++800+19+1000-19+900+18 =(200+200+800+900+1000+900)(11+2+9+19-18-19)4000-4 =3996