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Hướng dẫn giải bài tập SGK Toán lớp 4 trang 114: Rút gọn phân số

Thứ năm - 07/12/2017 03:35
Hướng dẫn giải bài tập SGK Toán lớp 4 trang 114: Rút gọn phân số
BÀI 1. (Hướng dẫn giải bài tập số 1 trang 114/SGK Toán 4)
Rút gọn các phân số:

Hướng dẫn giải​:


BÀI 2. (Hướng dẫn giải bài tập số 2 trang 114/SGK Toán 4)
Trong các phân số:

a) Phân số nào tối giản? Vì sao?
b) Phân số nào rút gọn được? Hãy rút gọn phân số đó?
Hướng dẫn giải​:

a) Các phân số tối giản là: 1/3; 4/7; 72/73
Vì tử số và mẫu số của mỗi phân số trên không cùng chia hết cho một số tự nhiên nào khác 1.
b) Các phân số rút gọn được là: 8/12; 30/36

BÀI 3. (Hướng dẫn giải bài tập số 3 trang 114/SGK Toán 4)
Viết số thích hợp vào ô trống:

Hướng dẫn giải​:

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