sin³t/2dt将dt换成dt/2时积分上限要不要换成π呢搜索结果第35页,早教吧

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aUFO.Lookatbrightlights.A.Its,it'sB.It's,itsC.It's,its'D.It's,it 英语

函数y=/-(x^2)-6x-5/的值域是：A.[0,2]B.[0,4]C.[-$,4]D.[0,+$]P.S:/为根号,$为无穷大符号...函数y=/-(x^2)-6x-5/的值域是：A.[0,2]B.[0,4]C.[-$,4]D.[0,+$]P.S:/为根号,$为数学

/为根号,$为无穷大符号.选

That’s a beautiful dress you have on A.A.Oh,thanks.I got it yesterday.B.B.Sorry,it's too cheap.C.C.You can have it.D.D.See you later. 英语

it’s not polite to ask()A.the price B.the date C.a women 's age D.a girl's name 英语

抛物线y=（x-1）^2-4与X轴交于BC两点B点在C点的左边顶点为A 若抛物线上有一点D 使S△BCD=1\2 S△ABC 求D点坐标数学

已知抛物线y=ax2+bx+c经过原点O,另有一条直线y=kx+4交此抛物线于点A（1,m）和点B（2,2）,交y轴于点C（1）求直线和抛物线的解析式（2）若此直线上有一点D,使得S三角形OCD=S三角形OAB,求点D主要解数学

It's time we the lecture because everybody has arrived.a.start b.will start c.started d.sIt's time we the lecture because ev 英语

rybody has arr

it's time ( )breakfast.A.have B.has C.having D.to haveit's time ( )breakfast.A.have B.has C.having D.to have 英语

-Where were you when the UFO arrived?-I was in the( )A.barber’s chair B.barber chairC.chair barder’s D.barber’s 英语

Who's that girl ___ my sister A This is B She is C It's D That's 英语

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