下面各题怎样简便就怎样计算. 785+399 ...
下面各题怎样简便就怎样计算.785+399425+79+25(63-25)×2348+157-3523800-1900-1100480+120÷61038-49678÷(...
下面各题怎样简便就怎样计算. 785+399 425+79+25 (63-25)×2 348+157-352 3800-1900-1100 480+120÷6 1038-496 78÷(45-42) 37×7-7+124.
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(1)785+399
=785+400-1
=1185-1
=1184
(2)425+79+25
=425+25+79
=450+79
=529
(3)(63-25)×2
=63×2-25×2
=126-50
=76
(4)348+157-352
=505-352
=153
(5)3800-1900-1100
=3800-(1900+1100)
=3800-3000
=800
(6)480+120÷6
=480+20
=500
(7)1038-496
=1038-500+4
=538-4
=534
(8)78÷(45-42)
=78÷3
=26
(9)37×7-7+124
=259-7+124
=252+124
=376
=785+400-1
=1185-1
=1184
(2)425+79+25
=425+25+79
=450+79
=529
(3)(63-25)×2
=63×2-25×2
=126-50
=76
(4)348+157-352
=505-352
=153
(5)3800-1900-1100
=3800-(1900+1100)
=3800-3000
=800
(6)480+120÷6
=480+20
=500
(7)1038-496
=1038-500+4
=538-4
=534
(8)78÷(45-42)
=78÷3
=26
(9)37×7-7+124
=259-7+124
=252+124
=376
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