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Huyenhai
2 năm trước
a, (1-x)/(x+1 )+3=(2x+3)/(x+1) b, ((x+2)^2)/(2x-3)-1=(x^2+10)/(2x-3) c, (5x-2)/(2-2x)+(2x-1)/2=1- (x^2+x-3)/(1-x) d, (5-2x)/3 + ((x-1)(x+1))/(3x-1)= ((x+2)(1-3x))/(9x-3)
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