7/11 + 3/4 + 4/11 + 1/4 = 7/11 + 4/11 + 3/4 + 1/4 = 1 + 1 = 2
7/11 + 3/4 + 4/11 + 1/4 = (7/11 + 4/11) + (3/4 + 1/4) = 1 + 1 = 2
7/11 + 3/4 + 4/11 + 1/4 = 7/11 + 4/11 + 3/4 + 1/4 = 1 + 1 = 2
7/11 + 3/4 + 4/11 + 1/4 = (7/11 + 4/11) + (3/4 + 1/4) = 1 + 1 = 2
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
3/4 -1/4 chia 1/3+1
36*22*51/11*17*12
( 3/7+3/5+3/11-3/37) chia (4/7+4/5+4/11-4/37)
moNG CÁC BN GIÚP
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
bài 1: tính nhanh:
A = 4/1*3*5+4/3*5*7+4/5*7*9+4/7*9*11+4/9*11*13
giúp mik nha !! Mik cảm ơn nhiều
7.tính bằng cách thuân tiện
1/11+3/4+4/11+1/4
1/1*2+1/2*4+2/4*7+3/4*7+4/7*11+5/11*6
dấu / là dấu chia
dấu * là dấu nhân nha
A,
7/11+3/4+4/11+1/4=
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
1/7+3/11+2/7+8/11+4/7+2010