题目内容
递等式计算,能巧算的要巧算
| 472+239+661 | 8324-813-187 | 7218÷9×7 | 320×8÷5. |
(1)472+239+661,
=472+(239+661),
=472+900,
=1372;
(2)8324-813-187
=8324-(813+187),
=8324-1000,
=7324;
(3)7218÷9×7,
=802×7,
=5614;
(4)320×8÷5,
=320÷5×8,
=64×8,
=(60+4)×8,
=480+32,
=512.
=472+(239+661),
=472+900,
=1372;
(2)8324-813-187
=8324-(813+187),
=8324-1000,
=7324;
(3)7218÷9×7,
=802×7,
=5614;
(4)320×8÷5,
=320÷5×8,
=64×8,
=(60+4)×8,
=480+32,
=512.
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