题目内容
怎么简便就怎么算:
| 794-198 | 68×99 | 6756-193-207 |
| 72×125 | 0.9+1.08+0.92+0.1 | 13.59-6.91-0.09. |
(1)794-198,
=794-(200-2),
=794-200+2,
=594+2,
=596;
(2)68×99,
=68×(100-1),
=68×100-68,
=6800-68,
=6732;
(3)6756-193-207,
=6756-(193+207),
=6756-400,
=6356;
(4)72×125,
=9×8×125,
=9×(8×125),
=9×1000,
=9000;
(5)0.9+1.08+0.92+0.1,
=(0.9+0.1)+(1.08+0.92),
=1+2,
=3;
(6)13.59-6.91-0.09,
=13.59-(6.91+0.09),
=13.59-7,
=6.59.
=794-(200-2),
=794-200+2,
=594+2,
=596;
(2)68×99,
=68×(100-1),
=68×100-68,
=6800-68,
=6732;
(3)6756-193-207,
=6756-(193+207),
=6756-400,
=6356;
(4)72×125,
=9×8×125,
=9×(8×125),
=9×1000,
=9000;
(5)0.9+1.08+0.92+0.1,
=(0.9+0.1)+(1.08+0.92),
=1+2,
=3;
(6)13.59-6.91-0.09,
=13.59-(6.91+0.09),
=13.59-7,
=6.59.
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