问题 解答题

用递等式计算:

(841-41)÷25×4

560÷[490÷(34+36)]

360÷(30+30)×2

224÷[(2+6)×2].

答案

(1)(841-41)÷25×4

=800÷25×4

=32×4

=128

(2)560÷[490÷(34+36)]

=560÷[490÷70]

=560÷7

=80

(3)360÷(30+30)×2

=360÷60×2

=6×2

=12

(4)224÷[(2+6)×2]

=224÷[8×2]

=224÷16

=14

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