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一、口算。
198 - 76 =
750÷15 =
48×40 =
454÷2 =
184÷4 =
78 + 98 =
720÷24 =
707÷7 =
198 - 76 =
122
421×3 = 1263
505 + 29 = 534
750÷15 =
50
310÷5 = 62
19×40 = 760
48×40 =
1920
425 + 106 = 531
600÷4 = 150
454÷2 =
227
160 + 39 = 199
430 + 570 = 1000
184÷4 =
46
364 - 36 = 328
301÷7 = 43
78 + 98 =
176
903÷3 = 301
2×380 = 760
720÷24 =
30
552÷4 = 138
20×47 = 940
707÷7 =
101
450÷50 = 9
410 - 300 = 110
答案
一、122 1263 534 50 62 760 1920 531 150 227 199 1000 46 328 43 176 301 760 30 138 940 101 9 110
解析
122；1263；534；50；62；760；1920；531；150；227；199；1000；46；328；43；176；301；760；30；138；940；101；9；110
二、计算下面各题,怎样简便就怎样计算。
(714 - 12)÷27 - 19 89×11 + 11 + 90 700 - 137 - 263 + 300
389 + 180÷5×20 500 - 391÷17×14 (420 - 100÷10)×11
(714 - 12)÷27 - 19 89×11 + 11 + 90 700 - 137 - 263 + 300
389 + 180÷5×20 500 - 391÷17×14 (420 - 100÷10)×11
答案
二、7 1080 600 1109 178 4510
解析
(714 - 12)÷27 - 19
=702÷27 - 19
=26 - 19
=7
89×11 + 11 + 90
=11×(89 + 1) + 90
=11×90 + 90
=90×(11 + 1)
=90×12
=1080
700 - 137 - 263 + 300
=(700 + 300) - (137 + 263)
=1000 - 400
=600
389 + 180÷5×20
=389 + 36×20
=389 + 720
=1109
500 - 391÷17×14
=500 - 23×14
=500 - 322
=178
(420 - 100÷10)×11
=(420 - 10)×11
=410×11
=4510
=702÷27 - 19
=26 - 19
=7
89×11 + 11 + 90
=11×(89 + 1) + 90
=11×90 + 90
=90×(11 + 1)
=90×12
=1080
700 - 137 - 263 + 300
=(700 + 300) - (137 + 263)
=1000 - 400
=600
389 + 180÷5×20
=389 + 36×20
=389 + 720
=1109
500 - 391÷17×14
=500 - 23×14
=500 - 322
=178
(420 - 100÷10)×11
=(420 - 10)×11
=410×11
=4510
