题目内容

(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].
(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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