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8 hours agoA2 Key for Schools COLLINS 8 Practice Test 1 VOLUME 2 | KET PET Mr Mol - Tải miễn phí sách PDF & KEY
![Find the value of a, if [[a-b,2a+c],[2a+b,3c+d]] = [[-1,5],[0,13]]](http://i.ytimg.com/vi/jeCnaP3haUk/mqdefault.jpg "Find the value of a, if [[a-b,2a+c],[2a+b,3c+d]] = [[-1,5],[0,13]]")
