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数学题一个步骤不明白,在线求帮助在三角形ABC中,a,b,c分别为ABC的对边,已知a+c=20,C=2A,cosA=3/4.求c/a的值,求b的值、c/a=sinC/sinA=sin2A/sinA=2cosA=3/2所以5a/2=20 =>a=8 c=1264 其他

b^2+144-18b=>

我用“√”选择画线字正确的读音。微风轻拂(fúfó)海滨(bīnbìn)挨打(āiái)风度翩翩(piānshān)濒临(bīnpīn)裸露(luǒkē)优劣(lüèliè)教语文

üè liè)

用所给单词或短语的适当形式填空have a great time ,floeer ,take away ,organize ,clean-up1、What kind of ____ do you plan to take when you go to the old 英语

eople's home?I

It's a beautiful place,but there are so many people there that I couldn't 为but there are so many people there that I couldn't find a p 英语

oper place to

1.He did not want to go( ).A.for one reason and others B.for one reason or othersC.for one reason and another D.for one reason or anot 英语

er2.What cours

I think you should go to bed early every day?A:Thank you for helping me B:Ok I willC:It doesn't matterD:That's a good ideawhy？英语

today is Saturday .But many people don't go out to S___the weekend ,because it's snowing heavily.i is c_ outside.On such s___ 英语

ays,most peopl

C语言计算圆的面积的问题代码为:#include #include #define PI 3.14;int main(void){float r,s; printf("输入圆的半径\n");scanf("%f",&r);s = r * r * PI;printf("圆其他

面积为:%f\n",s);r

若无穷等比数列{an}的前n项和为Sn,首项为1,公比为a-3/2,且limSn=a(a∈N*)则复数z=a-i在复平面上对应的点位于第几象限? 数学

复利的利率要怎么算?12000元,两年,利率为a%（未知数）,最终得到的钱是13230,已有答案为a是5,公式为A{n}=P(1+i%){n}{}里面为次方. 数学

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