282+47+153+18 | 563-199 | 704-350-50 | 600÷25÷4 | (4+400)×25 | 20×13×5 |
483-236-64 | 540÷36 | 83+83×99 | 45×102 | 48×25 | 900÷(5×9) |
1000×8÷125 | 43×12+18×43 | 19×99+19 | 32×99 | 156×63+156×36+156 | 36×111+888×8 |
分析 (1)根據(jù)加法交換律和結(jié)合律簡算;
(2)根據(jù)湊整法簡算;
(3)(7)根據(jù)減法的性質(zhì)簡算;
(4)(8)(13)根據(jù)除法的性質(zhì)簡算;
(5)(9)(10)(15)(16)(17)根據(jù)乘法分配律簡算;
(6)根據(jù)乘法交換律簡算;
(11)先把48分解成12×4,再根據(jù)乘法結(jié)合律簡算;
(14)根據(jù)乘法交換律簡算;
(18)先根據(jù)積不變規(guī)律把888×8變成111×64,再根據(jù)乘法分配律簡算.
解答 解:(1)282+47+153+18
=(282+18)+(47+153)
=300+200
=500
(2)563-199
=563-200+1
=363+1
=364
(3)704-350-50
=704-(350+50)
=704-400
=304
(4)600÷25÷4
=600÷(25×4)
=600÷100
=6
(5)(4+400)×25
=4×25+400×25
=100+10000
=10100
(6)20×13×5
=20×5×13
=100×13
=1300
(7)483-236-64
=483-(236+64)
=483-300
=183
(8)540÷36
=540÷(9×4)
=540÷9÷4
=60÷4
=15
(9)83+83×99
=83×(1+99)
=83×100
=8300
(10)45×102
=45×(100+2)
=45×100+45×2
=4500+90
=4590
(11)48×25
=(12×4)×25
=12×(4×25)
=12×100
=1200
(12)900÷(5×9)
=900÷9÷5
=100÷5
=20
(13)1000×8÷125
=1000÷125×8
=8×8
=64
(14)43×12+18×43
=43×(12+18)
=43×30
=1290
(15)19×99+19
=19×(99+1)
=19×100
=1900
(16)32×99
=32×(100-1)
=32×100-32×1
=3200-32
=3168
(17)156×63+156×36+156
=156×(63+36+1)
=156×100
=15600
(18)36×111+888×8
=36×111+111×64
=111×(36+64)
=111×100
=11100
點評 完成本題要注意分析式中數(shù)據(jù),運用合適的簡便方法計算.
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