Bài 1: Thực hiện phép tính (9/14-9/21):(4/5+5/6) b) 7/10-(-3)/4+(-5)/6-1/5+(-2)/3 c) 〖(-2)〗^3.(3/4-0,25):2 1/4-1 1/6 d) -1/7.(9 1/2-8,75):2/7+0,625:1 2/3 e) 15/18-(5/18.1/15+1 1/12) f) (-1/2)^2:1/4-2(-1/2)^3 g) 7/8.(-5)/9-7/8.4/9+5 7/8 i) (-1)/4.13 9/11-0,25.6 2/11 k) 3/5.7+3/7.9+⋯+3/59.6 n) (20% - 1,4).( - 5)2 – (1 - ).0,5

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