\(\left(1+\frac{1}{15}\right).\left(1+\frac{1}{16}\right).\left(1+\frac{1}{17}\right).\left(1+\frac{1}{18}\right)\)
=\(\frac{16}{15}.\frac{17}{16}.\frac{18}{17}.\frac{19}{18}\)
=\(\frac{19}{15}\)
TÍNH NHANH
a) 3/16 + 4/15 + 5/16 + 1/15
b) 6/7 x 8/15 x 7/6 x 15/16
c) 19/20 x 13/21 + 9/20 x 8/21
d) (1+ 10/15 ) x (1+ 1/16 ) x ( 1+ 1/17 ) x ( 1+ 1/18 )
MINK ĐANG CẦN GẤP
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.
a,(1+1/15)x(1+1/16)x(1+1/17)x(1+1/18)
b,(1-1/19)x(1-1/20)x(1-1/21)x(1-1/22)x(1-1/23)
giúp mình nha đây là bài của thầy minh khó quá
1+2+3+4+5...+15+16+17+18+19+20
Điền dấu thích hợp vào chỗ trống
1 5 + 1 6 + 1 7 + 1 8 + 1 9 . . . 1
A. >
B. <
C. =
Tính Nhanh: ( 1 - 1/15) × ( 1 - 1/16) × ( 1 - 1/17) × ..............................× ( 1 - 1/100)
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
(1+1/13)x(1+1/14)x(1+1/15)x(1+1/16)x(1+1/17)
