A)1/2x+3/5=-33/25
B)1/2+-3/7:x=0
C)(x-4/5):3=1/2
D)(x+1/2).2=4/25
E)3/(x+2)(x+5)+5/(x+5)(x+10)+7/(x+10)(x+17)-x/(x+2)(x+7)
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Sinh Học lớp 12
