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Test questions of junior two mathematics competition
Solution a? +b? +c? +4 is less than or equal to ab+3b+2c

Answer? +b? +c? +4-(ab+3b+2c)≤0

(a-b/2)? +3(b-2)? /4+(c- 1)? ≤0

a-b/2=b-2=c- 1=0

a= 1,b=2,c= 1

200 a+9 b+c = 200+ 18+ 1 = 2 19

Solution: Multiply both sides of the original inequality by 4 to get 4a? +4b? +4c? + 16-4ab- 12 b-8c =(2a-b)? +3(b-2)? +4(c- 1)? ≤0.= = = & gt2a-b=0,b-2=0,c- 1=0,= = = & gta= 1,b=2,c= 1。 = = = & gt200a+9b+c=2 19