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thuongfhoizz


a,tìm a,b,c biết:
(2008+3b+1)(2008^a+2008a+b)=225
b,tìm x,y,z,t thuộc N* biết:
M=\frac{x}{x+y+z}+\frac{y}{x+y+t}+\frac{z}{y+z+t}+\frac{t}{x+z+t}
































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(2008+3b+1)(2008^a+2008a+b)=225
b,tìm x,y,z,t thuộc N* biết:
M=\frac{x}{x+y+z}+\frac{y}{x+y+t}+\frac{z}{y+z+t}+\frac{t}{x+z+t}
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