1、2=182=72 3:略 4:820P9 1:412=2 2: 8 3:72+96402=1682=3360 3360280=12 4:58-10102=482=240P101:平方米 公顷 公顷平方米 2:200005 500000160 100000 1003: 4:200200=40000平方米=4公顷 5:15072=10800有P116:3公顷=30000平方米 30000600=507:20004=500500500=250000平方米=25公顷8: 300+5001002=800=40000平方米=4公顷 70004=28000 没有9:种棉花4220=840 种大豆68-422
2、02=262=260P12 1:公顷平方千米 平方厘米(6)千米 2000 4 700 7000000 6 6000000 4: 36004=900 900900=810000平方米=81公顷 没有P131:图一117=77图二 (17+25)2 =422=420 图三62=242: 1512=180 3: 10060=6000 50(80-60)=5020=1000 6000+1000=7000P141:1292=54158=120 (15+30)2=452=450 83+82=24+8=32P15 3:(30-2)15=2815=420 42020=8400 4: (60+40)2=100
3、2=1500 802=1200 1500+1200=2700 5:P16 1:12 15 9 5 2:18 48 34P171: 600481 410 244 202=300平方米 300500=150000克=150千克 3: 902=12P181:80100105 2:略 3:2 16000070300450 4500000 54P194:9公顷=90000平方米9000030=450000千克=450吨40=400 10+10+202=402=400800+400=1200 6: 4168P201:4/100.445/100 0.45 8/1000.08 88/100 0.880.6 0
4、.05 0.75 0.68 0.95 3:0.04 0.0040.005 0.0350.235P21 5.一位小数:0.70.3两位小数:0.340.10三位小数:0.3000.334 6. 400x100=40000平方米=4公顷 4x12000=48000尾7.20平方厘米8. 略P22 1.0.21.42.5 0.020.070.140.25 2. 略3.2个102个0.012个0.12个0.0012个12个1 4. (1)1010(2)50.702P23 (3) 30.04 (4) 665 (5) 0.780.78 5. 20.0320.30 30.0230.20 200.3300.2
5、2.0032.0302.3003.0023.0203.200 0.032 6. 0.6米9.6米 7. 略P241:402080.03 0.05120.2 2.31500 2.70-2.7 5.23-5.2300 0.80没有 5.407-5.4070 0.014没有 0.14- 0.1400.03 0.506 5.0650.60.8504.0003.960 10.5006.4000.0500.70012.000 9.0203.0904.20P25 6. 0.50 6.60 1.05 3.2 0 7. 9.510.5 8.60+40302=10015=1500平方厘米P26 1.大小不变:3.
6、40.095.0303.03大小变了:76802 2.0.620.520.50.054. P27 5:0.07 0.91 0.920.930.31 0.320.33以上答案不唯一6: 44.654645.6945 88.00197170.0770冬冬高 丁丁重 略 8: 马宁第一 李明第二 林鸣第三P28-291:8.178.0966 47.750.985 0.9967.898 30.77016.9196650000-65万 65000-6.5万 60500-6.05万600500-60.05万 605000-60.5万21.72 179.4 40075.4 4.00754 2.78153 1
7、.88934 0.89219 5:2247 1158 1455 479 479115814552247P301:个百分一2:保留整数保留一位小数保留两位小数2.915232.92.929.97361010.09.971.039611.01.04(1) 209 (2)0.1 50.0 (3)7.430.302.26 4: 6:行星名称平均距离/千米平均距离/亿千米平均距离/亿千米( 保留两位小数)水星579100000.57910.58金星1082100001.08211.08地球1496000001.4961.50火星2279400002.27942.28木星7783300007.78337.
8、78土星142940000014.29414.29天王星287099000028.709928.71海王星449697000044.969744.97P315:大洋面积面积/平方千米面积/万平方千米面积/万平方千米(保留两位小数)6太平洋1786800001786817868.00印度洋761740007617.47617.4 0大西洋916550009165.59165.50北冰洋147880001478.81478.80 7: 9.910.19.9910.01P32 1:0.06 2.49 2:2.6 0.15 0.230.39十分 个10 千 0.01 145 一十分之一千分之一P33
9、4: 5.046.4 3.8 0.9 5: = 6:0.05 60.02 7.090王师傅快 李师傅慢 8:表格填2 李勇胡佳明张小松 王军P34 1:4.5 0.8 1.65 0.006 2:3.32.923.20 3.210.57841110.610.5819.989920.019.99 65.4365.4 21.9421.9 14.57814.6 60.4422 60.4P35 6: 7:4200 75.5 960 8: 1.49 3.625.11 1.53.65.1 9: 3.853.863.873.883.893.903.91 3.923.933.94 共10个P36 1:8.9 1
10、.4 0.6 8 0.2 2: 20.9 4.73 3.31 5.284.5+10.62=15.12 10.62-8.45=2.17 4:0.24+0.35+0.41=1P37 1: 3.69.5 4.2 5.90.4 2.06 3.121.240.89 4.1 12.3-6.49=5.81 5:1.5-0.35-0.45=0.7被减数6.4897.2减数4.322.253.854.7差2.166.753.356.3P38 1:0.230.751.33 0.770.390.9655.77 4.561.05 3:40.82 1.813.52 (2)加数21.48.461.035.245.51.0
11、60.294.76和26.99.521.32P39 5:15.8-3.5=12.3 50-9.6-15.8=24.6 6:50+40-8.8=81.2 7:小帆 小月P40 1.4.10.60 9.01.212.88 6.21 11.80 3.11.641.085 4.余额从上往下依次:636.30603.704183.704033.404045.903994.603981.97 合计:3592.50367.33P41 5. (1)0.210.3210.43210.987654321 (2)1.682.5683.45685.2345686. (1)1.54-1.46=0.08米 第一辆高,高0
12、.08米 (2)5.27-4.18=1.09米 第一辆长,长1.09米 7. 3.16+0.24-0.19=3.21米P42-43 1. 6.00.211.461.00.320.8 14.334.410.49 4.573.118.126.66 6.004.544.100-9.28-29.65=61.07元 5.(5.1-1.49)-1.49=2.12亿平方千米 6. 2.45+6.25+2.45=11.15元不够5.3+10.8+33.9= 50元 8.合计:37.2元 找零:12.8元P44 1. 1.854 7.2200 686.815.01.50 3. 480048004.8 8.286
13、.827.6 5.2256525 5. 2.4x48=115.2米P45 6.75.6x12=907.2 1000元够27x30=810千瓦时810x0.52=421.2元 8. (1)3.2+3x2.56=10.88元(2)20-4x4.8=0.8元P46 1: 111 40.313000.51.290.0070.46512.90.074.6100501290.746100050012907460 100 10001000 100081 1230 6302 5: P476:12.0968 136.34 7:2.0410=20.4 3061.2 8: 0.72100=72505=10 104.
14、8=48P481: 0.2 0.90.120.02 2:1.31.03 3: 2.4 216=3.5 5:84.567=3.02P50 1:604900 0.76 91.80.08 0.7 0.85 4: P51 5:4.77=32.9 11.652=29 6:(24.2+16.4)7=40.67=5.8 (24.2+16.4)14=40.614=2.9 108(303)=10890=1.2P521:2.7 10 42 0 2:34.04 3.404340.4 3.40434.043.123.15 2.7822.0249.88 4:11.0411.5 5:16.80.7=11.76不够P531
15、: 0.480.48 90.90.09 2: 0.720.054 0.058 3:0.11050.0435 4:3.250.325 0.03250.03254.52=9 0.2=0.9 6: 0.62.3=1.38P54 1: 0.690.6 0.5 6.1 0.07 3:3.11.0 4: 0.984.30精确到个位精确到十分位精确到百分位精确到千分位9.30729.39.319.3072.96273.02.962.963P55 5:美国8.43.6=30.2430.2 中国15.78.4=131.88131.9(201)2.85+4.9=192.85+4.9=59.0559 7:28.53
16、=85.5P561: 5.20.072 0.72 0.052 0.0072 2: 0.08885.9920.5743.62=7.22=224.22=8.4 2.5=9 112.5=27.52.5=10.5 =P57 5:4.882.4=11.71211.713.6=17.68 17.75.953.5=20.82520.812.41.7+12.4=21.08+12.4=33.481.712.4=8.68480(0.40.4)=4800.16=76.8P581: 0.210.12 2.11.2 2:72.812.5 909864 6211.20.5 70.0056 207 2.5 1.2 0.004P59 5:2.80.5=5.6 6: 352.5=14 48.3(3+0.5)=48.33.5 =13.8 后一种便宜(5018.5)4.5=31.54.5=7P60 1: 50120 2:161 401610 400161007.20.720.4545 450 4:18028 4000380 2 7.5P61 5:15.
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