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A B AC的词语有哪些
已知三角形ABC的周长a+
b
+c=6,b^2=
ac
求三角形ABC面积的最大值 求BA向 ...
答:
cosB=(a^2+c^2-
b
^2)/2
ac
≥1/2,故
B
≤60 a+c+√ac=6,ac≤4两式都在a=c时等号成立,故三角形ABC面积的最大值=acsinB/2=√3 向量BA*BC=accosB=(a^2+c^2-b^2)/2=[(6-b)^2-3b^2]/2=-b^2-6b+18(0<b=√ac≤2)∈[2,18)
已知方程3x2+2(a+b+c)x+
ab
+bc+
ac
=0有两个相等的实数根,
答:
判别:4(a+b+c)^2-3*4*(
ab
+bc+ca)=0 a^2+b^2+c^2-(ab+bc+ca)=0 1/2[(a^2+b^2-2ab)+(b^2+c^2-2bc)+(c^2+a^2-2
ac
)=0 1/2[a-b)^2+(b-c)^2+(c-a)^2]=0 因为:[a-b)^2>=0,(b-c)^2>=0,(c-a)^2]>=0 所以:a-b=0.b-c=0,c-a=0 ...
在△ABC中,
b
^2=
ac
,a^2-c^2=ac-bc,求
A的
大小及bsinB/c的值
答:
a^2=
b
^2+c^2-2bccosA a^2-c^2=b^2-2bccosA 而:b^2=
ac
,a^2-c^2=ac-bc 所以:ac-bc=ac-2bccosA cosA=1/2
A
=60度 而:b/sinB=a/sinA sinB=bsinA/a bsinB/c=(b^2)sinA/(ac)=sinA=(根号3)/2
下列几种说法中,正确的是()A.若
AC
=BC,则A=
B
B.若C分之A=C分之B,则A...
答:
B
四点A.
B
.C.D再一直线上.则有几条线段.有几条射线若
AC
=12厘米BD=8厘米...
答:
6条线段,2条射线,
AB
=7,BC=5,CD=3
请问y=√x的图像是什么样的?
答:
y=√x图像,其中x≥0,y≥0 /iknow-pic.cdn.bcebos.com/e824b899
a
9014c08449af53b067
b
02087af4f48f"target="_blank"title="点击查看大图"class="ikqb_img_alink">/iknow-pic.cdn.bcebos.com/e824b899a9014c08449af53b067b02087af4f48f?x-bce-process=image%2Fresize%2Cm_lfit%2Cw_...
y= x²的图像是什么图像
答:
y=√x图像,其中x≥0,y≥0 /iknow-pic.cdn.bcebos.com/e824b899
a
9014c08449af53b067
b
02087af4f48f"target="_blank"title="点击查看大图"class="ikqb_img_alink">/iknow-pic.cdn.bcebos.com/e824b899a9014c08449af53b067b02087af4f48f?x-bce-process=image%2Fresize%2Cm_lfit%2Cw_...
y= x³图像是什么图像
答:
y=√x图像,其中x≥0,y≥0 /iknow-pic.cdn.bcebos.com/e824b899
a
9014c08449af53b067
b
02087af4f48f"target="_blank"title="点击查看大图"class="ikqb_img_alink">/iknow-pic.cdn.bcebos.com/e824b899a9014c08449af53b067b02087af4f48f?x-bce-process=image%2Fresize%2Cm_lfit%2Cw_...
y= x& amp; gt;2的图象是什么图
答:
y=√x图像,其中x≥0,y≥0 /iknow-pic.cdn.bcebos.com/e824b899
a
9014c08449af53b067
b
02087af4f48f"target="_blank"title="点击查看大图"class="ikqb_img_alink">/iknow-pic.cdn.bcebos.com/e824b899a9014c08449af53b067b02087af4f48f?x-bce-process=image%2Fresize%2Cm_lfit%2Cw_...
y= x²的图像是什么图像?
答:
y=√x图像,其中x≥0,y≥0 /iknow-pic.cdn.bcebos.com/e824b899
a
9014c08449af53b067
b
02087af4f48f"target="_blank"title="点击查看大图"class="ikqb_img_alink">/iknow-pic.cdn.bcebos.com/e824b899a9014c08449af53b067b02087af4f48f?x-bce-process=image%2Fresize%2Cm_lfit%2Cw_...
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