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华杯赛初赛小学模拟(5)答案

发布时间:2014-01-21 09:01:04  

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WW??????L 1??C ????????0??4???x??3???y??4x+3y=25??????x=4,y=3?x=1,y=7,??????????C? 2??A 362+548×361362+548×361362+548×361???===1 362×548?186361×548+548?186361×548+362 3??A ??????125.6r2=62.8(??)?????62.8r3.14r2=10(??)????3.14h102h2+62.8h10=1256(????)? 4??C ????8h7h6h5?r?4h3h2h1?˙70???C? 5??D ???????=?????????П??????????ABC?????1??????r,??????R???R2˙45?R2˙90?r2ˇr2˙R2???r2211˙45???????=h3.14h45ˉ?h3.14h90ˉ45?˙45? 24 6??C???? ??????????????2ˉ0.5˙1.5????6ˇ1.5˙7.5????????7?30??????? ??????L 7????12h3r?0.96ˉ0.81?˙240??? 240h0.96r12˙19.2???? 20h12r0.96˙250??? 8????1.57??? ????????П??3.14h4r3,14r2=2(?) 11h3.14h22h1.5h=1.57(???) 34

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WWW.HUABEISAI?∈???6ˇ2?÷2˙4???/?? ∈???6ˉ2?÷2˙2???/?? 10????40 ?????3?????∈???1????.∈?????1???50????3?????10????????3???????1????????∈? ??3???x????? x+x+(x+40)=50h2 ?П? x=20 20+40-50=10(??? 10r20=0.5??? 50r?1-0.5?=100???/?? ?100-20?r2=40???/?? .CN3612??x+y=12?12+20=12 ?П???xy{x=6y=2

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