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已知0°<θ<30°,且sinθ=km+(k为常数且k<0),则m的取值范围是
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波长为λ的单色光垂直入射到光栅常数为d缝宽为b总缝数为N的光栅上取k=012则决定出现主极大的衍射角
Nb sinθ=kλ
b sin θ=kλ
Nd sin θ=kλ
d sinθ=kλ
如果一次函数y=kx+bkb是常数k≠0的图象经过第一二四象限那么kb应满足的条件是
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已知αβ≠kπ+k∈Z且sinθ+cosθ=2sinα①sinθcosθ=sin2β.②求证
如果一次函数y=kx+bkb是常数k≠0的图象经过第一二三象限那么kb应满足的条件是
k>0且b>0
k>0且b<0
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如果一次函数y=kx+bkb是常数k≠0的图象经过第一二四象限那么kb应满足的条件是
k>0,且b>0
k<0,且b>0
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k<0,且b<0
已知一次函数y=kx+bkb为常数且k≠0的图象经过点A0﹣2和点B10则k=b=.
设fx在[01]上连续在01内二阶可导f0=f1=0对任意的x∈01fx<0且fx在[01]上的最大
如果函数y=kx+bkb是常数的图象不经过第二象限那么kb应满足的条件是
k≥0且b≤0
k>0且b≤0
k≥0且b<0
k>0且b<0
如果已知一次函数y=kx+b的图象不经过第三象限也不经过原点那么kb的取值范围是
k>0且b>0
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k<0且b>0
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已知一次函数y=kx-kk为常数且k≠0.则下列说法正确的
函数图象必过点(1,1)
函数图象必过点(2,1)
函数图象必过点(1,0)
函数图象必过点(一l,1)
k>0,且b>0
k<0,且b<0
k>0,且b<0
k<0,且b>0
如果一次函数y=kx+bkb是常数k≠0的图象经过第一二四象限那么kb应满足的条件是
k>0,且b>0
k<0,且b>0
k>0,且b<0
k<0,且b<0
设函数fx在闭区间[01]上连续在开区间01内可导且f0=f1=1[*].求证对任何满足0<k<1的
已知一次函数y=kx+bkb为常数且k≠0的图象经过点A.0﹣2和点B.10则k=b=.
已知0°<θ<30°且sinθ=km+k为常数且k<O则m的取值范围是.
如图所示一次函数y=kx+bkb为常数且k≠0与正比例函数y=axa为常数且a≠0相交于点P.则不等
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某种病毒经30分钟繁殖为原来的2倍且知病毒的繁殖规律为y=y0ekt其中k为常数t表示时间单位小时y
已知函数fx=ex﹣kxx∈R.k为常数e是自然对数的底数.Ⅰ当k=e时证明fx≥0恒成立Ⅱ若k>0
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OnMarch14theBritishphysicistStephenHawkingpassedawayathishome.Afterthatmanypeople1expresstheirsadness.Inmodernhistorytherehasperhapsneverbeenascientistas2['pɒpjələr]asHawking.WhetherhewaseducatingtheworldwithhisknowledgeormakingfunofhimselfinTVshowsit's3toimaginewhattheworldwillbelikenowHawkingisnolongerinit. Hawkingis4rememberforhisworkinscience.He5[ik'spleind]hisbeliefthatspacestartedwiththeBigBangandwillendwithblackholes.Thistheorycangiveustheanswerstoquestionslikehowdidtheuniverse宇宙beginandhowwillitend. Besideshisworkinsciencehealsomanagedtoovercome克服many6difficultinhispersonallife.Attheageof21hecaughtthemotorneuronsillnessandhewastoldheonlyhadashorttimetolive.7hewentontobecomeoneofthe8greatmindsintheworld. NowHawkingisnolongerwithusbuthewill9[kən'tɪnjuː]toinspiretheworld.AsheoncesaidhimselfLookupatthestarsandnotlook10atyourfeet. 1. 2. 3. 4. 5. 6. 7. 8. 9. 10.
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