Toán Lớp 6: B1 : Tính hợp lí
a. 28/45 – ( 8/45 – 17/51 – 3/11 )
b. (11/4 – 5/9 – 4/9 × 11/4 ) × 8/13
c . (17/28 + 18/29 – 19/30 – 20/31) × ( -5/21 + 1/4 + 1/6)
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Toán Lớp 6: B1 : Tính hợp lí
a. 28/45 – ( 8/45 – 17/51 – 3/11 )
b. (11/4 – 5/9 – 4/9 × 11/4 ) × 8/13
c . (17/28 + 18/29 – 19/30 – 20/31) × ( -5/21 + 1/4 + 1/6)
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