
用简便方法计算.例如:72÷12=72÷2÷6=36÷6=648÷1645÷3÷390÷1556÷1454÷18388-199=388-200+1=188
用简便方法计算.例如:72÷12=72÷2÷6=36÷6=648÷1645÷3÷390÷1556÷1454÷18388-199=388-200+1=188+1=18910...
用简便方法计算.例如:72÷12=72÷2÷6=36÷6=648÷1645÷3÷390÷1556÷1454÷18388-199=388-200+1=188+1=1891000-99-1-98-2-97-3-96-4434-197999+99+9.
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48÷16
=48÷8÷2,
=6÷2,
=3;
45÷3÷3
=45÷(3×3),
=45÷9,
=5;
90÷15
=90÷3÷5,
=30÷5,
=6;
56÷14
=56÷7÷2,
=8÷2,
=4;
54÷18
=54÷9÷2,
=6÷3,
=2;
1000-99-1-98-2-97-3-96-4
=1000-(99+1)-(98+2)-(97-3)-(96+4),
=1000-100-100-100-100,
=600;
434-197
=434-(200-3),
=434-200+3,
=234+3,
=237;
999+99+9
=1000-1+100-1+10-1,
=1000+100+10-(1+1+1),
=1110-3,
=1107.
=48÷8÷2,
=6÷2,
=3;
45÷3÷3
=45÷(3×3),
=45÷9,
=5;
90÷15
=90÷3÷5,
=30÷5,
=6;
56÷14
=56÷7÷2,
=8÷2,
=4;
54÷18
=54÷9÷2,
=6÷3,
=2;
1000-99-1-98-2-97-3-96-4
=1000-(99+1)-(98+2)-(97-3)-(96+4),
=1000-100-100-100-100,
=600;
434-197
=434-(200-3),
=434-200+3,
=234+3,
=237;
999+99+9
=1000-1+100-1+10-1,
=1000+100+10-(1+1+1),
=1110-3,
=1107.
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