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Hướng dẫn giải bài tập SGK Toán lớp 4 trang 127: Phép cộng phân số (tiếp theo)

Thứ ba - 12/12/2017 07:49
Hướng dẫn giải bài tập SGK Toán lớp 4 trang 127: Phép cộng phân số (tiếp theo)
BÀI 1. (Hướng dẫn giải bài tập số 1 trang 127/SGK Toán 4)
Tính:

Hướng dẫn giải​:
a) Bước 1: Quy đồng mẫu số:

Bước 2: Cộng hai phân số:

b)
Bước 1: Quy đồng mẫu số:

Bước 2: Cộng hai phân số:

c)
Bước 1: Quy đồng mẫu số:

Bước 2: Cộng hai phân số:

d)
Bước 1: Quy đồng mẫu số:

Bước 2: Cộng hai phân số:

BÀI 2. (Hướng dẫn giải bài tập số 2 trang 127/SGK Toán 4)
Tính (theo mẫu)
Mẫu:


Đáp án:
a) Các em làm như sau:

b) Các em làm như sau:

c) Các em làm như sau:

d) Các em làm như sau:

BÀI 3. (Hướng dẫn giải bài tập số 3 trang 127/SGK Toán 4)
Một xe ô tô giờ đầu chạy được 3/8 quãng đường, giờ thứ hai chạy được 2/7 quãng đường.
Hỏi sau hai giờ ô tô đó chạy được bao nhiêu phần quãng đường?
Đáp án:
Sau hai giờ ô tô đó chạy được số phần quãng đường là:

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