问题 解答题

(1)8×39×125

(2)78+143+122+157

(3)3600-128÷8×25

(4)95×23+6×23-23

(5)986÷34×62-1200

(6)984÷[(457-273)÷23].

答案

(1)8×39×125

=(8×125)×39

=1000×39

=39000;

(2)78+143+122+157

=(78+122)+(143+157)

=200+300

=500

(3)3600-128÷8×25

=3600-16×25

=3600-4×(4×25)

=3600-4×100

=3600-400

=3200

(4)95×23+6×23-23

=(95+6-1)×23

=100×23

=2300;

(5)986÷34×62-1200

=29×62-1200

=1798-1200

=598;

(6)984÷[(457-273)÷23]

=984÷[184÷23]

=984÷8,

=123.

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