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1.方程组{ax+y=a~2 x+ay=1 有多少解? 2.方程组{ax+y+z=1 x+ay+z=a x+y+az=a~2 有多少解?3.解方程|x-1|+|x-2|+|x-3|=x。 4.解方程(x+3-4(x-1)~(1/2)~(1/2)+(x+8-6(x-1)~(1/2))~(1/2)=1。5.下列方程是否有实根?
1. How many solutions are there in the equation group {ax+y=a~2 x+ay=1? 2. Equation group {ax+y+z=1 x+ay+z=a x+y+az=a~2 How many solutions? 3. Solution equation |x-1|+|x-2|+|x-3|=x. 4. Solution equation (x+3-4(x-1)~(1/2)~(1/2)+(x+8-6(x-1)~(1/2))~(1/ 2) = 1. 5. Does the following equation have real roots?