问题 解答题

递等式计算.

(1)(720÷8+21)×3

(2)400÷[300-(260-160)]

(3)35×(26÷2+7)

答案

(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.

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