Tính
a) 4/3*7 + 4/7*11 + 4/11*15 + 4/15*19 + 4/19*23 + 4/23*27
b) 1/2*3 + 1/3*4 + 1/4*5 + 1/5*6 +1/6*7
c) 2/3*5 + 2/5*7 + 2/7*9 + 2/9*11 + 2/11*13 + 2/1*2 + 2/2*3 + 2/3*4 + 2/8*9 + 2/9*10
A=2/3*5 + 2/5*7 + 2/7*9 + 2/9*11 + 2/11*13 + 2/11*15
B=2/1*2 + 2/2*3 + ..........+2/9*10
Giup mình theo kiểu bài như dưới đây nhé :
D =4/3*7 + 4/7*11 + 4/11*15 +............. + 4/23*27
D=7/3*7 - 3/3*7 + 11/7*11 + ................. + 23/23*27
D=1/3 -1/7 +1/7 - ................. - 1/27
D= 1/2 - 1/27
D= 8/27
1/3+1/5......1/3 : 1/5
1/3-1/4.....1/3 * 1/4
11/12-11/12....2/3-1/4
B=1/1*2*3*4 + 1/2*3*4*5 + 1/3*4*5*6 + 1/8*9*10*11 + 1/9*10*11*12 = ?
2/3-(1/6+1/8)
4 2/3+2 3/4x7 3/11
2 1/10-3/4-2/5
2-x=4/7
3/5x4/7x1 1/2
x nhân 2/5=4/7
X:6/11=44/9
Giúp em
1/11+2/11+3/11+4/11+...+10/11
Tính Nhanh : A = 5/2*1 + 4/1*11 + 3/11*2 +1/2*15 + 13/14*4
a) 5 1/3-2 2/3
b) 5/12+5/6-3/4
c) 1-(1/5+1/2)
d)11 1/4-(2 5/7+51/4)
e) (8 5/11+3 5/7)-35/11
Giúp mình với trước 7h30 các bạn nhé!
CẢM ƠN MỌI NGƯỜI NHIỀU
2/7 : 1/4 - 1/7
7/11 x 0 + 5/9 : 1/2
( 3/7 + 1/4 ) : 3/4
4/3 x 1/2 + 7/2 : 1/4
1) Tính NHa
a)563x23+23x38-23
b)7/11+3/4+4/11+1/4-1và2/5
c)(1-1/2)x1-1/3)x1-1/4)x......(1-1/10)
d)2/7x3/9+2/7x2/3