A, 6/7×8/13+6/13×9/7-3/13×6/7 B, -1/4×152/11+63/4×-1/11 C, -9/25×53/3-(-3/5)^2×22/3 Đ, -21/10+21/10×3/4-3/4

0 bình luận về “A, 6/7×8/13+6/13×9/7-3/13×6/7 B, -1/4×152/11+63/4×-1/11 C, -9/25×53/3-(-3/5)^2×22/3 Đ, -21/10+21/10×3/4-3/4”

1. A, 6/7×8/13+6/13×9/7-3/13×6/7

   = 6/7 x (8/13 – 3/13) +6/13×9/7

   = 6/7 x 5/13 + 54/91

   = 30/91 + 54/91

   = 12/13

   B, -1/4×152/11+63/4×(-1/11)

   = -38/11 – 63/44

   = -152/44 – 63/44

   = -215/44

   C, -9/25×53/3-(-3/5)^2×22/3

   = -9/25×53/3 – 9/25 x 22/3

   = 9/25 x (-53/3 – 22/3)

   = 9/25 x (-25)

   = -9

   Đ, -21/10+21/10×3/4-3/4

   = -21/10+ 63/40 – 3/4

   = -51/40

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