题目内容
递等式计算.
(1)(720÷8+21)×3
(2)400÷[300-(260-160)]
(3)35×(26÷2+7)
(1)(720÷8+21)×3
(2)400÷[300-(260-160)]
(3)35×(26÷2+7)
(1)(720÷8+21)×3,
=(90+21)×3,
=111×3,
=333;
(2)400÷[300-(260-160)],
=400÷[300-100],
=400÷200,
=2;
(3)35×(26÷2+7),
=35×(13+7),
=35×20,
=700.
=(90+21)×3,
=111×3,
=333;
(2)400÷[300-(260-160)],
=400÷[300-100],
=400÷200,
=2;
(3)35×(26÷2+7),
=35×(13+7),
=35×20,
=700.
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