\(x = {-b \pm \sqrt{b^2-4ac} \over 2a}\) làm như thế nào/////////////////
K
Khách
Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
20 tháng 5 2021
dạ chào oog cháu xin trả lời 1+1=....................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................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20 tháng 5 2021
1 + 1 = 2
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;
2. Không trả lời linh tinh, không phù hợp với nội dung câu hỏi trên diễn đàn.
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.
20 tháng 5 2021
Kết quả là 2432902008176640000. Vậy có 4 chữ số 0 đứng cuối
I
1
YN
20 tháng 5 2021
Từ trang 1 đến trang 9 cần sử dụng số chữ số là:
( 9 - 1 ) : 1 + 1 = 9 ( chữ số )
Từ trang 10 đến trang 99 cần sử dụng số chữ số là:
[ ( 99 - 10 ) : 1 + 1 ] × 2 = 180 ( chữ số )
Từ trang 100 đến trang 350 cần sử dụng số chữ số là:
[ ( 350 - 100 ) : 1 + 1 ] × 3 = 753 ( chữ số )
Tổng số chữ số phải sử dụng là:
9 + 180 + 753 = 942 chữ số
Đáp số: 942 chữ số
20 tháng 5 2021
2 giờ rưỡi = 2 giờ 30 phút = 2,5 giờ
Sau 2 giờ rưỡi xe thứ 1 đi được số ki - lô - mét là
44,5 × 2,5 = 111,25 ( km )
Sau 2 giờ rưỡi xe thứ 2 đi được số ki - lô - mét là
45,5 × 2,5 = 113,75 ( km )
Hai xe cách nhau bao xa là
250 - ( 113,75 + 111,25 ) = 25 ( km )
Đáp số : 25 km
HT
3
20 tháng 5 2021
Có số học sinh 10 tuổi là:
40 : 100 x 75 = 30 (học sinh )
Đ/S: 30 học sinh
~ Hok T ~
20 tháng 5 2021
+ 19: Mười chín + Mười một: 11
+ 70: Bảy mươi + Mười chín: 19
~ Hok T ~
day dau phai toan lop 1