内容正文:
二、观察物体(二)◆
二、观察物体(二)
1.计算并验算。
(1)827-369=
(2)803÷73=
(3)105×62=
(4)635+465=
2.计算下面各题。
(1)(85+240)÷(30-5)
(2)356+324÷18×5
三
(3)327-[11×(6+13)]
(4)(120×2+120)÷15
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四年级下(R)
(5)96+12×(4+18)
(2)(×)
(4)905-(136+45)×5
=96+12×22
改正:(76+28)÷2×26
=905-181×5
=96+264
=104÷2×26
=905-905
=360
=52×26
=0
(6)(96+12)×4+18
=1352
(5)905-136+45×5
=108×4+18
(3)(×)
=905-136+225
=432+18
改正:4×(50-18)÷2
=769+225
=450
=4×32÷2
=994
(7)38×24-6+17
=128÷2
(6)[905-(136+45)]×5
=912-6+17
=64
=[905-181]×5
=906+17
(4)(×)
=724×5
=923
改正:200-[15×(12-4)]
=3620
(8)38×(24-6)+17
=200-[15×8]
(7)(640÷8+22)×4
=38×18+17
=200-120
=(80+22)×4
=684+17
=80
=102×4
=701
(5)(×)
=408
(9)38×[24-(6+17)]
改正:287-[127-(65+35)]
(8)37×(24÷2+8)
=38×[24-23]
=287-[127-100]
=37×(12+8)
=38×1
287-27
=37×20
=38
=260
=740
(10)56÷8+15-9
(6)(×)
第13页
=7+15-9
改正:30×(6-2)÷2
1.(1)827-369=458
=22-9
=30×4÷2
827验
458
=13
=120÷2
-369
+369
458
爱
827
(11)56÷8+(15-9)
=60
(2)803÷73=11
=56÷8+6
第12页
=7+6
(1)410×[(662-74)÷49]
11
73
73803验×11
=13
=410×[588÷49]
73算
73
(12)56÷[8+(15-9)]
=410×12
73
73
=56÷[8+6]
=4920
73
803
=56÷14
(2)8000÷[8×(703-699)]
0
=4
=8000÷[8×4]
(3)105×62=6510
第11页
=8000÷32
105
105
(1)(×)
=250
×62验626510
210算
62
改正:52+8×(26-17)
(3)(540+2418÷78)×17
630
310
=52+8×9
=(540+31)×17
6510
310
=52+72=124
=571×17=9707
0
54
附录参考答案
(4)635+465=1100
(2)127+35+873
(5)439+(61+284)
635
1100
=127+873+35
=(439+61)+284
+465
验
-465
=1000+35
=500+284
1100
算
635
=1035
=784
2.(1)(85+240)÷(30-5)
(3)346+157+54
(6)328+105+95
=325÷25
=346+54+157
=328+(105+95)
=13
=400+157
=328+200
(2)356+324÷18×5
=557
=528
=356+18×5
(4)147+256+453
(7)236+(264+159)
=356+90
=147+453+256
=(236+264)+159
=446
=600+256
=500+159
(3)327-[11×(6+13)]
=856
=659
=327-[11×19]
=327-209
(5)281+127+319
(8)337+229+171
=118
=281+319+127
=337+(229+171)
(4)(120×2+120)÷15
=600+127
=337+400
=(240+120)÷15
=727
=737
360÷15
(6)238+369+162
(9)255+(145+158)
24
=238+162+369
=(255+145)+158
第14页
400+369
=400+158
1.(1)127+365=492
769
=558
127
验
365
第15页
(10)524+183+217
+365
+1