题目内容
用递等式计算.
720÷(22-12)×2
[558-(195+38)]÷25
360×[480÷(236-116)].
720÷(22-12)×2
[558-(195+38)]÷25
360×[480÷(236-116)].
(1)720÷(22-12)×2,
=720÷10×2,
=72÷2,
=36;
(2)[558-(195+38)]÷25,
=[558-233]÷25,
=325÷25,
=13;
(3)360×[480÷(236-116)],
=360×[480÷120],
=360×4,
=1440.
=720÷10×2,
=72÷2,
=36;
(2)[558-(195+38)]÷25,
=[558-233]÷25,
=325÷25,
=13;
(3)360×[480÷(236-116)],
=360×[480÷120],
=360×4,
=1440.
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