脱式计算,能简算的要简算.31×8×125 984-87×(360÷60) 2...
脱式计算,能简算的要简算.31×8×125984-87×(360÷60)235+78+16552×71+29×5225÷[125÷(625÷25)]42×198....
脱式计算,能简算的要简算.31×8×125 984-87×(360÷60) 235+78+165 52×71+29×52 25÷[125÷(625÷25)] 42×198.
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(1)31×8×125
=31×(8×125)
=31×1000
=31000;
(2)984-87×(360÷60)
=984-87×6
=984-522
=462;
(3)235+78+165
=235+165+78
=400+78
=478;
(4)52×71+29×52
=(71+29)×52
=100×52
=5200;
(5)25÷[125÷(625÷25)]
=25÷[125÷25]
=25÷5
=5;
(6)42×198
=42×(200-2)
=42×200-42×2
=8400-84
=8316.
=31×(8×125)
=31×1000
=31000;
(2)984-87×(360÷60)
=984-87×6
=984-522
=462;
(3)235+78+165
=235+165+78
=400+78
=478;
(4)52×71+29×52
=(71+29)×52
=100×52
=5200;
(5)25÷[125÷(625÷25)]
=25÷[125÷25]
=25÷5
=5;
(6)42×198
=42×(200-2)
=42×200-42×2
=8400-84
=8316.
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