Toán Lớp 7: a, -2/5+(-5/9+2/5)
b, -7/9.4/11+-7/9.7/11+5 7
9
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Toán Lớp 7: a, -2/5+(-5/9+2/5)
b, -7/9.4/11+-7/9.7/11+5 7
9
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