在三角形abc中 a*2-b=2(b+c)=2c-3,sinC：sinA=4：根号下13帮下忙哈求a bc

在三角形abc中 a*2-b=2(b+c)=2c-3,sinC：sinA=4：根号下13帮下忙哈求a bc
在三角形abc中 a*2-b=2(b+c)=2c-3,sinC：sinA=4：根号下13
帮下忙哈
求a b
c

在三角形abc中 a*2-b=2(b+c)=2c-3,sinC：sinA=4：根号下13帮下忙哈求a bc
你要求什么?

怎么有2（b+c)=2c-3，那岂不是得到2b=-3，b=-1.5?是不是题出错了还是打错字了 ？

Research In Motion has finally unveiled the BlackBerry Torch (aka BlackBerry 9800) ? its first smartphone to feature a sliding QWERTY keyboard, and the first to run the all new BlackBerry OS 6 that we...

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Research In Motion has finally unveiled the BlackBerry Torch (aka BlackBerry 9800) ? its first smartphone to feature a sliding QWERTY keyboard, and the first to run the all new BlackBerry OS 6 that we’ve been hearing so much about lately.
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Here’s what the new BlackBerry has to offer (official photos included after the specs list):
Unwired View Wireless News, Views and Reviews Home Contact Archives Advertise with us About Us AT&T’s BlackBerry Torch (9800 slider) with BlackBerry OS 6 gets official By Florin on 03 Aug 10 for left, and for right -->
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Quad-band GSM/GPRS/EDGE (850 / 900 / 1800 / 1900MHz)
Quad-band UMTS (2100 / 1900 / 850 / 800MHz)
3.2 inch, 480 x 360 pixels touchscreen display
Full QWERTY keyboard
Wi-Fi 802.11b/g/n
GPS
Bluetooth 2.1
3.5 mm headset jack
Full HTML tabbed browser (based on WebKit) with pinch-to-zoom capability
BlackBerry Enterprise Service and BlackBerry Internet Service
Social networking integration (Facebook,bulgari watches, Twitter, MySpace)
5MP camera with flash
512MB RAM
4GB onboard memory
4GB memory card included
1300 mAh battery. Talk time: up to 5.5 hours; stand-by time: up to 13 days (on 3G)
111 x 62 x 14.6 mm
161.1 grams
According to RIM, the BlackBerry Torch 9800 will be available via AT&T starting August 12, for $199 on contract.? You can check out the new smartphone here at AT&T, or here at RIM. Follow Us on:
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The Torch appears both on RIM’s and AT&T’s websites and, as expected, it will be available via the second-largest US carrier later this month.

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