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四海
速算
21
单项
作业
答案
速算单项作业二【练习一】假设分配/“415”份数法题干6655.4%72329.9%59616.8%600132A=631600159S034A=55833b4A=6562X=斗八325B6X=6584X=38答案6313465316515581380题于341912.5%139415.0%31920.1%819101516X=38244A=1212X=53A=3320030X=182A=266122答案30393801221822659535题干7417.9%33513.7%440826.4%70055A=687300,41A=29430079A=34874X=54X=492B13谷案687354329544053487921题干20998.1%777317.6%589132.7%八200,16A=193601106A=661400131A=444个X=16X=116哭X145614414谷案19421576610116344391452题干692A-9.1%455-6.3%677-8.0%-A=485700-6X二-69A=736A=761X=-309-15136-3答案7622-6944863-306736-59第4页【练习二】除法拆分62.9%373296+77=50%+13%=63%=457-24=50X-3%-=47%47.37%9=301+40=50X+6.6%=56.6%3=356+30=5%+0.4%*=5.4%5.42%56.646.09%366=5%+11=6=521=1%+1.7%=171.60 x68.85=193+73=50X+20-1%=69%=692+152=50%+10%+1%=61%60.98%23.93%=630-27=25-1X=24=61+7=2020.1B%=310116-15=3%-0.2=2.8%2.77%118.07%653070.30%367+149=147=50+2+不=337-13=20%-0.7%+=19.3%19.23%【练习三】加法、减法、乘法题干6-37-235-12913379843答案29135379643题干32-p51-12473-1902-1429139554788答案291395541788题干79012.3%43623.5%694 51.0%47311.8%=790(10%+2+0.)=436(25%-1.S)=694(5%+1%)=473(10X+15+0.)=79+16+2=109-6=347+7=47十5+497三103=354=6谷案97.2102.5353.955.6题干86332.3%72242.5%336x14.4%7384.2%=863(33.3X-1%)=722(5%-8%+0s)=336x=738(5X-0.8X)=28B-9=361-5B+4=48=36-5三279=307答案278-7306.946.431.0题干求和63222467432521477085593528723324142L9答案152611526155185516第5页