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26 tháng 11 2017
Số lần số học sinh cả lớp gấp số học sinh nam là :
28 : 7 = 4 (lần)
Đ/S : 4 lần
17 tháng 7 2015
Mẹ Ba hơn em Ba số tuổi là: 32 - 6 = 26(tuổi)
Hiệu số tuổi của 2 người không thay đổi theo thời gian.
Khi tuổi em Ba bằng 1/3 tuổi mẹ Ba thì mẹ của Ba hơn em Ba là: 1 - 1/3 = 2/3
Tuổi em Ba khi đó là: 26 : 2 = 13(tuổi)
Vậy sau 7 năm nữa(13 - 6 = 7) thì tuổi em Ba bằng 1/3 tuổi mẹ Ba
16 tháng 11 2015
lớp 3A có số học sinh giỏi bằng số học sinh cả lớp là:
7:35=\(\frac{7}{35}=\frac{1}{5}\)
Đáp số:\(\frac{1}{5}\)
Tick ủng hộ mình nha bạn
NT
Nguyễn Thị Thương Hoài
Giáo viên
VIP
19 tháng 3
\(3a758\) : 9 dư 2 khi và chỉ khi 3 + a + 7 + 5 + 8 : 9 dư 2
(3 + 7 + 8) + 5 + a : 9 dư 2
18 + 5 + a : 9 dư 2
5 + a : 9 dư 2
vì a ≤ 9 ⇒ 5 + a ≤ 14 mà a + 5 : 9 dư 2 nên
a + 5 = 11
a = 11 - 5
a = 6
Vậy \(\overline{3a578}\) = 36578
VG
27
8 tháng 7 2015
Hiệu số tuổi của 2 mẹ con tôi là:
32 - 6 = 26 (tuổi)
vì mỗi năm mẹ và tôi sẽ tăng lên và hiệu này sẽ ko thay đổi :
Tuổi tôi lúc tuổi tôi bằng 1/3 tuổi mẹ là:
26 : ( 3 - 1) x 1 = 13 ( tuổi )
Vậy cần thêm số năm nữa để số tuổi tôi bằng 1/3 tuổi mẹ là:
13 - 6 = 7 ( năm )
đáp số.......
AS
1
HV
20 tháng 2 2018
I. Nội qui tham gia "Giúp tôi giải toán"
1. Không đưa câu hỏi linh tinh lên diễn đàn, chỉ đưa các bài mà mình không giải được hoặc các câu hỏi hay lên diễn đàn;
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3. Không "Đúng" vào các câu trả lời linh tinh nhằm gian lận điểm hỏi đáp.
Các bạn vi phạm 3 điều trên sẽ bị giáo viên của Online Math trừ hết điểm hỏi đáp, có thể bị khóa tài khoản hoặc bị cấm vĩnh viễn không đăng nhập vào trang web.
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