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Cho phương trình 2(a-1).x+a(x-1)=3a (phương trình 1) và (7x-108)/8-2(x-9)=-1/4.(x+3) (phương trình 2) a. Chứng tỏ phương trình (1) có nghiệm duy nhất khi a khác 1/3, tìm nghiệm duy nhất đó b. Giải phương trình (1) khi a=2 c. Tìm giá trị của a để phương trình (2) có một nghiệm bằng 1/2 nghiệm của phương trình (1) Giúp mình với! Mình gấp lắm!
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