Toán Lớp 6: -1/2-(-3/5)+(-1/9)+1/27+1/18+4/35-(-2/7) Giúp mik với;-(((( -

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Toán Lớp 6: -1/2-(-3/5)+(-1/9)+1/27+1/18+4/35-(-2/7) Giúp mik với;-((((