Cho phương trình a.(ax-1)=x.(3a-2)-1. Tìm a để phương trình vô nghiệm 

giúp mình với ạ mình cần ngay bây giờ a

            Australia is the 6th biggest country in the world. Only Russia, China, Canada, USA and Brazil are (1)  ______ . It is the world’s largest island.

           Even though the country is so big, it only has about 23 million inhabitants. 88% of all Australians (2) ______in the big cities or smaller towns, which makes big areas of the country empty.

           Australia lies in the (3) ______  hemisphere which means that the more South you go, the cooler it gets. In the north parts of the country, it is always hot. The (4)______ of the country has really hot summers and mild winters. Snow only falls in the Australian Alps and in Tasmania. When we have (5)  ______  in Europe and Asia, the Australians have summer. So they celebrate Christmas in the (6)______ of the summer!

           Australia is famous for its wildlife. The most famous (7) ______  is probably the kangaroo. The kangaroo, or roo for short, has (8) ______    Australia’s national Symbol. The word “kangaroo” was the first Aboriginal (9)  ______   in the English language. There are several spices of kangaroos. The red kangaroos (10) ______the biggest ones and they are found in the middle of the country.

tìm số nguyên x để R=x+1/3x^3-2