cos43ƞ2cos77ƞ2+sin43ƞ2cos167ƞ2_百度作业帮
cos43ƞ2cos77ƞ2+sin43ƞ2cos167ƞ2
乱码：ƞ2&&是角度的意思,原式=cos43cos77+sin43cos167=cos43cos77-sin43sin77=cos(43+77)=cos120=&-&1/2(9-xƝ5分之xƝ5+2x-3)Ɲ6×(-1-x分之x-3)因式分解_百度作业帮
(9-xƝ5分之xƝ5+2x-3)Ɲ6×(-1-x分之x-3)因式分解
(9-xƝ5分之xƝ5+2x-3)Ɲ6×(-1-x分之x-3)=[(x^2+2x-3)/(9-x^2)]^3*[-(x-3)/(1-x)]=[(x-1)(x+3)/(3-x)(3+x)]^3*[-(x-3)/(1-x)]=[(x-1)/(3-x)]^3*[-(x-3)/(1-x)]=-[(x-1)/(x-3)]^250Ɲ5-409;0ﾅ5_百度作业帮
50Ɲ5-409;0ﾅ5
7+7Ɲ5+7Ɲ6+7的4次方…+7的2013次方\r\n=7的2014次方-7用配方法解xƝ5+x-6=0_百度作业帮
用配方法解xƝ5+x-6=0
x^2+x-6=0x^2+x=6x^2+x+1/4=6+1/4(x+1/2)^2=25/4所以x+1/2=±5/2所以x=-3,或x=2望采纳tìng càn .tƣ0i bƢ0 khƣ0ng cèn中文意思_百度作业帮
tìng càn .tƣ0i bƢ0 khƣ0ng cèn中文意思
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