Giải Vở bài tập Toán 3 bài 39: Luyện tập

Thứ ba - 20/08/2019 13:16
Giải Vở bài tập Toán 3 bài 39: Luyện tập
1. Tìm x:
a) x + 15 = 20
            x = 20 - 15
            x = 5
b) x - 18 = 16
            x = 16 + 18
            x = 34
c) 72 - x = 50
            x = 72 - 50
            x = 22
d) x x 7 = 42
            x = 42 : 7
            x = 6
e) x : 7 = 5
            x = 5 x 7
            x = 35
g) 49 : x = 7
            x = 49 : 7
            x = 7

2. Tính:
giai VBt toan lop 3 bai 39 cau 2

3. Một cửa hàng có 24 đồng hồ, đã bán số đồng hồ. Hỏi cửa hàng đã bán bao nhiêu đồng hồ?
Tóm tắt:
giai VBt toan lop 3 bai 39 cau 3
Bài giải:
Số chiếc đồng hồ đã bán là:
24 : 6 = 4 (chiếc)
Đáp số: 4 chiếc.

4. Khoanh vào chữ đặt trước câu trả lời đúng:
Số dư trong phép chia 38 : 5 là:
A. 1  
B. 2  
C. 3
D. 4
Đáp án đúng là: C. 3
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