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Hướng dẫn giải bài tập SGK Toán lớp 5 trang 159, 160: Ôn tập về phép trừ

Thứ tư - 10/01/2018 03:23
Hướng dẫn giải bài tập SGK Toán lớp 5 trang 159, 160: Ôn tập về phép trừ

Câu 1: Tính rồi thử lại (theo mẫu):

8923 – 4157;                              27069 – 9537

7,284 – 5,596 ;                           0,863 – 0,298 

Câu 2: Tìm x:

a) x + 5,84 = 9,16

b) x – 0,35 = 2,55

Câu 3: Một xã có 540,8ha đất trồng lúa. Diện tích đất trồng hoa ít hơn diện tích đất trồng lúa 385,5ha. Tính tổng diện tích đất trồng lúa và trồng hoa của xã đó.

HƯỚNG DẪN GIẢI

Câu 1: Tính rồi thử lại (theo mẫu):

Câu 2: Tìm x:

a) x + 5,84 = 9,16

x = 9,16 – 5,84

x = 3,32.

b) x – 0,35 = 2,55

x = 2,55 + 0,35

x = 2,9.

Câu 3:

Diện tích đất trồng hoa là:

540,8 – 385,5 = 155,3 (ha)

Diện tích đất trồng lúa và đất trồng hoa là:

540,8 + 155,3 = 696,1 (ha)

Đáp số: 696,1ha

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