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1、273= 9015= 484= 64016= 393= 2420= 323= 4816= 128= 273= 5614= 248= 142= 8345= 56080= 9624= 4020= 4030= 3726= 7639= 60559= 3023= 128= 2732= 4827= 450020= 7315 = 120600 = 200360= 6800400= 280270= 42500= 600040= 51280= 4.32.7 0.750.25 40.26 0.352.7 4.61.9 0.830.3 30.05 7.23.8 0.070.6 1.390.39 105.43844=
2、88874 59237= 38432= 184610= 46839= 146020= 502= 784= 24.514=49.53=0153= 4625= 37410= 739=103=1.23=2-0.8=10.7-5.7=0.52+0.08=25=80.030.01100=300.01=01.22=0.65=1.2-0.9=0.540.6=0.260.3=10.05=200.4=2.8+10.2=7-0.9=0.55+0.3=0.8+0.2=160.4=0.145=2.54=15.3-10=3.3+7=610=0.86+2.14=0.37+4=3.20.8=0.45+0.55=6.48=8
3、55= 64080=210030=36090=964=786=234=2304=5403=6030=25050=1540=708=1206=72-42=4509=81090=360+90=524=1160=970=5409=56010=580-400=7208=4080=245=102+20=5006=4203=50050=4560=5505=72080=580-180=42042=360-40=3606=4907=324=55200=12060=49070=353+547=420-220=250050=50198=0.19.02=110100=1.019=3.110=1257125=0.65
4、5=0.17=32.50.5=2.580.2=0.77.32=480199=630.7=81.8=0.34.44=2.087=108=0.87.62=0.128=4.20.1=1.63=1.20.6=100200=6.20.3=0.60.7=8211899=2.870=0.90.4=2.170.1=52.12.1=2.540.5=500.04420=3.40.121=1002.10.03=6.9319=3.71.260.74=2.341.340=(1.52.5)0.77=310.250.75=34.121.50.9=9.7120.312=380.010.02=(1.20.16)0.1=6.39
5、=568499=95=8.21.9=16090=1.24=3.440.56=6.82.9=0.69=4254=4.20.8=7.342=5.41.8=2.730=7.342.14=1.015=510100=3.744.26=2.48=3.20.04=0.540.9=0.42.5=0.160.3=3.18100=410.4=0.860.02=0.085=1.830=8000.4=1.26=345670=81616=3.640=3.21.6=70.16=9.93=0.030.010.3=1.2584=3.65.84.2=6.8205=0.34170.02=(1.50.5)2=0.81.2515=0
6、.2446=0.90.37=300.21.5=1005.680=9.82.93.1=1.0280.16=0.250.40.1=0.4240.25=4.080.3=9.33.5=7113=93030=1900.2=3.60.3=1.20.4=50.55=4.20.8=63045=1625=0.80.4=0.80.10.5=2.80.720=0.80.62=5(3.22.6)=5.40.90.8=(1.40.8)0.6=5550.5100=3.2620.01=(5.12.7)0.6=7.43.6=2.540=1.3520=0.560.28=6.12.08=5.28=7.240=4.30.01=0.
7、060.8=6.525.12=3.61.8=0.544=0.728=92=500.3=0.12100=62.09=1.84=126.2=245=70.8=10.16=7.60.70.3=1.2580.74=1.82.26.4=0.650.45=4.270.60.4=3.60.80.2=8.541.72.3=1.050.7=0.420.58=40.39=42.55=800.4=0.750.2=70.6=7.20.5=10156=802.6=7.86.65=4.02300=9.810=120.5=6.12=6.83.2=10032.5=2.525=0.90.99=4000.1=4.53=3.10.
8、5=0.830.2=2.029=30.33=2.742=60.02=2.760.36=0.060.9=5.83.4=320.7=250.01=4.10.5=19.042=0.740.24=36.055=4.71.9=3.4611=3.264=8.13=8.42.7=24.328=0.90.6=0.80.04=0.364100=161.6=7.80.2=2.44.8=0.1258=71.34=80.25=90.36=0.3710=2.90.6=0.80.7=5.32.9=2.813.5=17.22.8=8.44.2=1.73=8.33.3=3.66.4=0.846=0.75=5.53.6=300
9、1.2=6.255=72080.1=0.7547.5=2.50.74=0.91003=2(6.44.6)=2.80.76=19.60.25=7.867.869=0.250.75=120.5=161.6=5.41.8=250.04=105.6=1.2580=1.233=82.6=630.09=6.20.2=7.82.2=5.40.9=0.442=0.2540=0.20.5=6.43.2=7.55.4=0.010.9=420.7=0.712.4=9.90.510.1=7.32.54=1.2583.7=126.23.8=2.445.64=3.91(51.09)= (4254)6=1263243=6.
10、020.30.3=32.12.50.4=45.75.56=10.21310.21=45.75.56=100.60.6=13.70.25400=四年級(jí)數(shù)學(xué)運(yùn)算律學(xué)案 知識(shí)點(diǎn)整合1、兩個(gè)數(shù)相加,交換加數(shù)的位置,結(jié)果不變,這叫做加法的交換律。用字母表示為a+b=b+a。2、三個(gè)數(shù)相加,先把前兩個(gè)數(shù)相加,再和第三個(gè)數(shù)相加;或者先把后兩個(gè)數(shù)相加,再和第一個(gè)數(shù)相加,它們的結(jié)果不變,這叫做加法的結(jié)合律。用字母表示為(a+b)+c=a+(b+c)。3、兩個(gè)數(shù)相乘,交換乘數(shù)的位置,結(jié)果不變,這叫做乘法的交換律。用字母表示為a*b=b*a。4、三個(gè)數(shù)相乘,先把前兩個(gè)數(shù)相乘,再和第三個(gè)數(shù)相乘;或者先把后兩個(gè)數(shù)相乘,
11、再和第一個(gè)數(shù)相乘,它們的結(jié)果不變,這叫做乘法的結(jié)合律。用字母表示為(a*b)*c=a*(b*c)。小試牛刀1、在 內(nèi)填上數(shù),在 內(nèi)填上運(yùn)算符號(hào),在橫線上填上運(yùn)用的運(yùn)算定律。293717137。425842。4728。4273973427。3521221。4516451773041772、計(jì)算6426后,可以交換兩個(gè)數(shù)的位置驗(yàn)算,是用了律。例題講解例一:443756變式:1634926174137326例二:5632變式:36252512532課后作業(yè):二、用豎式計(jì)算下面各題,并驗(yàn)算。618324762872818三、簡(jiǎn)便計(jì)算。24940218935211165483236645821571826552152343522 54045254036四、解決實(shí)際問(wèn)題1、食堂買(mǎi)來(lái)5筐西紅柿,每筐24千克,每千克2元,這些西紅柿一共多少元?2、一只熊貓?bào)w重75千克,一只小象的體重比熊貓的12倍少20千克,小象的體重多少千克?3、每個(gè)書(shū)架有三層,每層大約放20本書(shū)。1三個(gè)書(shū)架大約一共放多少本書(shū)?(2)學(xué)校圖書(shū)館又新買(mǎi)來(lái)550本新書(shū),增加幾個(gè)這樣的書(shū)架比擬適宜?