题目内容
| 简便计算 (1)2999×23+23 | (2)469-(175+69) | (3)808-156-144 |
| (4)301×31-31 | (5)54×102 | (6)88×125. |
(1)2999×23+23,
=23×(2999+1),
=23×3000,
=69000;
(2)469-(175+69),
=469-69-175,
=400-175,
=225;
(3)808-156-144,
=808-(156+144),
=808-300,
=508;
(4)301×31-31,
=31×(301-1),
=31×300,
=9300;
(5)54×102,
=54×(100+2),
=54×100+54×2,
=5400+108,
=5508;
(6)88×125,
=11×(8×125),
=11×1000,
=11000.
=23×(2999+1),
=23×3000,
=69000;
(2)469-(175+69),
=469-69-175,
=400-175,
=225;
(3)808-156-144,
=808-(156+144),
=808-300,
=508;
(4)301×31-31,
=31×(301-1),
=31×300,
=9300;
(5)54×102,
=54×(100+2),
=54×100+54×2,
=5400+108,
=5508;
(6)88×125,
=11×(8×125),
=11×1000,
=11000.
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