Giải vở bài tập Toán 7 chương I bài 10: Làm tròn số - Luyện tập

Thứ sáu - 25/10/2019 03:24
Hướng dẫn Giải vở bài tập Toán 7 chương I bài 10: Làm tròn số - Luyện tập
Bài 1.
Theo quy ước làm tròn số, ta có:
5,832     ≈ 5,83;           21,319 ≈ 21,32;
68,2375 ≈ 68,24 ;        40,602 ≈ 40,60;
0,255     ≈ 0,26;           70,997 ≈ 71.

Bài 2.
Điểm trung bình môn toán học kỳ I của bạn Cường là:
 =  ≈ 7,3

Bài 3.
76324753 ≈ 76324750 (tròn chục)
                 ≈ 76324800 (tròn trăm)
                 ≈ 76325000 (tròn nghìn)
       3695  ≈ 3690 (tròn chục)
                 ≈ 3700 (tròn trăm)
                 ≈ 4000 (tròn nghìn)
Bài 4.
a) 495.52     ≈ 500.50 = 25000
b) 82,36.5,1 ≈ 80.5 = 400
c) 6730:48   ≈ 7000 : 50 = 140

LUYỆN TẬP
Bài 1.
1 in ≈ 2,54cm
Do đó 21 in ≈ 2,54cm . 21 = 53,34cm
Đường chéo màn hình của chiếc ti vi này dài khoảng 53,34cm.

Bài 2.
Chu vi của mảnh vườn là:
2.(10,234 + 4,7) = 29,868 (m) ≈ 30 (m) 
Diện tích của mảnh vườn là:
10,234 . 4,7 = 48,0998 (m2) ≈ 48 (m2)

Bài 3:
1 lb        ≈ 0,45 kg
Vậy 1kg ≈ 1 : 0,45 (lb)
1 kg        ≈ 2,22 lb.

Bài 4:
giai vbt toan 7 bai 10 cau 4
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