3/5+6/11+7/13+2/5+6/11+19/3
= (3/5+2/5)+(6/11+6/11)+7/13+19/3
= 1 + 12/11 + 7/13+19/3
= 23/11 + 7/13+19/3
= 23/11 + 268/39
= 3845/429
1+2+3+4++5+6+7+8+9+10+11+12+13+14++15+16+17+18+19+20
Hoi tong tren bang bao nhieu (tinh nhanh va giai thich cach lam)
Tinh 5/11:4/3+5/6:1/8
Các ban ghi
Canh lam giup minh nha dau / la phan
1+2-3+4-5+6-7+8-9+10...19+20 tinh nhanh bang bao nhieu giai thich cach lam
tinh tong cua day so 0; 2 ;4 ;6............x biet x la so hang thu 24 cua tong cac ban giai giup minh bai nay nha ban nao lam nhanh thi minh like
bai2: tinh gia tri bieu thuc: 9/11*(6/7-5/6) lam kieu gi
giup minh voi
minh tich 5 ban thoi nha
tim so be nhat ma khi chia so do cho 3,4,5 ta lan luot duoc cac so du la 2,3,4.
( cac ban oi giai giup minh nha )
ban nao giai dung nhanh nhat de hieu minh tick )
lam theo cach lop 4
khong dc tinh BCNN hoac UCLN
Tim x:
x:2 phan 6=5/3:1/3
Ghi ca cach giai nha!
(/) nghia la phan
Dien < > =
A 2/3:5/6. 4/5×2/3
B 1/2×3/4. 5/8:6/8
C 9/7:3/2. 7/6:1/4
D 13/12:12/11. 11/10:10/9
Cac ban nho ghi ket qua cuoi moi phan so nhe
Mỗi lít xang can nang 4/5 kg. Hoi mot can chứa 40 l xang can nang bao nhieu , biet rang can rỗng can nang 2 kg
cac ban giai giup minh nha va ghi cach lam