Ta có
1/2 + 2/6 + 3/9 + 4/12 + 5/15 + 6/18
= 1/2 + 1/3 x ( 5 )
= 1/2 + 5/3
= 3/6 + 10/6
= 13/6
t nha bn
1/2+2/6+3/9+4/12+5/15+6/18=13/6
Đáp số :13/6
Tinh :1/2+2/6+3/9+4/12+5/15+6/18
tính : a) 2/3 *( 2/18+6/12-3/33 ) b) 6/14+4/25-5/10*3/16 c)5/25*(9/18+16/32-12/46) + 9/17 d)11/32:(14/18-16/27) + (2/3-5/15) e) ( 1/9+2/17)+3/6-(12/17-1/2) +5/9
bài 1:
1/4 + 2/3 2/7 + 2/3 2/5 + 1/3 2/3 + 1/2 1/3 + 3/5 4/5 + 1/3
1/8 + 3/4 1/36 + 5/12 1/3 + 1/6 + 1/18.
bài 2:
15/16 - 3/16 17/18 - 5/6 3/4 - 4/9 1/2 - 2/5 5/6 - 3/10 3-1/3
4/5 - 1/10 5/2 - 1 5/8 - 2/5.
tinh nhanh
4 + 8 + 12 + 16+... + 200
5 + 10 + 15 + 20 + ... +295 + 300
2+ 4 + 6 + 9 + ... + 98 + 100 - [ 1 + 3 + 5 + ... + 97 + 99]
1 - 2 + 3 - 4 + 5 - 6 + ... + 101 - 102 + 103
16 - 18 + 20 - 22 + 24 - 26+ ... + 64 - 66 + 68
tính 1/3+2/6+3/9+4/12+5/15+6/18(nhập kết quả là số tự nhiên)
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
a 7/15 + (5/6 - 1/3) =
b 4/7 *21/16 : 5/8 =
c 15/8 - 4/9 * 6/8+ 1/6 =
d 5/12+(3/4 + 2/3 ) : 34/3 =
1+2+3+4+5+6+7+8+9+10+11+12+13+14+15+16+17+18+19+20=????????? ko dung may tinh oke!!!
Điền số thích hợp vào chỗ chấm :
a) 1/2 =...../4 = 3/..... =...../8 = 5/.....
b) 1/3 = ..../6 = 3/.... = ....../12 = ...../15
c) 3/4 = ...../8 = 9/.... = ...../16 = 18/.....
d) 4/3 = 8/..... = ....../9 = 16/..... = ....../15
e) 6/4 = ...../2 ; 6/3 = 4/......
g) 4/2 = ..../6 = 24/......
