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1、2.52= 0.510= 0.68= 2.12=2.810= 0.70.8= 0.0420= 5.6+0.4=4.7+2.3= 4.52= 6.92.5= 7.20.8= 63.4= 0.620.32= 1.40.5= 0.75100=0.020.5= 3.60.3= 6.37= 5.6100=0.750.25= 0.1258= 4.80.3= 0.862=0.5628= 0.360.4= 0.640.8= 0.79=3.624= 0.81.1= 7.2+12.8= 46.73.8=12.84= 5.213= 12.55= 1.64+4.1=1020= 2415= 8.6510= 0.350.
2、6=3.080.01= 4.951000= 6.90.1= 0.40.5=2.40.8= 10.89= 9.60.8= 0.1082=4.950.9= 9.650.1= 0.325100= 2.58=0. 560.7= 0.1254= 3.280.1= 3.90.13=7.20.1= 0.010.1= 0.250.4= 1.60.8=12.5= 1.250.8= 3.20.04= 01.7=0.22102= 9.60.8= 50.24= 4.50.05=3.90.13 16.50.5= 50.12= 240.5=4.80.5= 2.84.2= 0.842.1= 50.25=7.80.01= 5
3、.40.6= 3.25= 70.62=0.560.8= 7.42.8= 0.180.2= 0.168=4.50.02= 87.2= 1.230= 0.0120.2=7.30.3= 06= 3.60.12= 7.80.6=25= 4.55= 0.30.6= 0.960.2=10.50.4= 7.30.27= 80.125= 0.540.6=二、估算（40道）1、48262 62872 558079 4185620402= 606= 9009= 28+2= 146= 700-300= 51-3= 217= 217= 18+16= 6008= 78-28= 80+120= 560= 152= 128
4、= 36-12= 120-20= 162= 50-25= 20+180= 2004= 393= 20-14= 165= 402= 217= 402= 402= 40-25= 50+3= 660-600= 50+50= 6008= 27+36= 20-20= 30+6= 5+17= 603= 8003= 480-80= 60006= 1303= 120-20= 2、打字员正在打篇文章共有1160个字，每行字数为 29，最多能排多少行？3、同学们跑步，跑了1480米，用了11分钟，大约每分钟跑多少米？4、全校同学去春游，共1025人，每辆车坐48人，大约需要多少辆车？三、巧算（60道）4.02+5
5、.4+0.98 5.17-1.8-3.2 13.75-(3.75+6.48)3.68+7.56-2.68 7.85+2.34-0.85+4.66 35.6-1.8-15.6-7.23.82+2.9+0.18+9.1 9.6+4.8-3.6 7.14-0.53-2.475.27+2.86-0.66+1.63 13.35-4.68+2.65 47.8-7.45+8.80.398+0.36+3.64 15.75+3.59-0.59+14.25 42.5-(6.07+1.13)73.8-1.64-13.8-5.36 66.86-8.66-1.34 0.2516.243.723.5+6.283.5 36
6、.8-3.9-6.1 2 5.48-(9.4-0.52)4.87.8+780.52 3.6102 6.40.25+3.6432+4.9-0.9 4.8-4.80.5 (1.25-0.125)84.8100.1 56.59.9+56.5 7.0910.8-0.87.094.23.5 3201.258 18.769.9+18.76 3.522.50.44.780.2+3.44 3.9-4.1+6.1-5.9 0.491.4 1.252.532 3.6-0.62 3.6510.1 3.6-3.60.8 15.20.254 5.63.5 9.60.80.4 4.299+4.2 0.89100.1 14
7、6.5-(23+46.5) 17.8(1.784) 5.832+4.27 (45.9-32.7)80.125 9.799+9.7 4.3612.58 15.613.1-15.6-15.62.1 0.65101 27.53.7-7.53.7 8.542.50.4 3.834.56+3.835.44 4.3612.58 15.613.115.615.62.1 0.65101 8.542.50.4 五年级上册数学口算题78100= 0150= 320.4= 1300300=2.6100= 15015= 320.4= 2600100=32.88= 1.644= 30060= 18700=40080=
8、644= 36020= 42070=194= 54090= 742= 36040=27030= 54060= 5719= 7070=40050= 35070= 81090= 4305=6.61.1= 7.64= 1.540.22= 4800200=1.890.63= 3600180= 1283.2= 11055=32.841= 7500.5= 4.320.8= 96012=20040= 42030= 14271= 56080=600.02= 66030= 4800.8= 724=0.6321= 6400800= 0.0520= 511.7=4816= 7035= 9.22.3= 2.70.3=1.50.4= 280.03= 0.3819= 0.683.4=402= 65013= 98014= 68034=7204=80016= 7200.5 23046=6000.03=16040= 0.2330= 501.2=330030=9600300= 4000500= 2500500=1.4300= 0.26200= 0.5090= 56070=1500300= 0.05200= 72009=
