2+1/8+1/32+1/72+1/128+1/200+1/288<9/4
Tính hợp lí
a) 8/9 - 1/72 - 1/56 - 1/42 - 1/30 - 1/20 - 1/12 - 1/6 - 1/2
b) 0,5 + 1/3 + 0,4 + 5/7 + 1/6 - 4/35
a, (3-1/4+2/3)-(5+1/3-6/5)-(6-7/4+3/2)
b, 1/3-3/4+3/5+1/64-2/9-1/36+1/15
c, 0,5+1/3+0,4+5/7+1/6-4/35
d, 8/9-1/72-1/56-1/42-1/30-1/12-1/6-1/2
Tinh hop li
Nhanh nhe! Milk se tang 3 hinh anh than tuong bn muon.
Tính:
1/3 - 3/4 - ( -3/5 ) + 1/72 - 2/9 - 1/36 + 1/15
Tính nhanh:
A = 1/3 - 3/4 - ( - 3/5 ) + 1/72 - 2/9 - 1/36 + 1/15
B = 1/ 5 - 3/7 + 5/9 - 2/11 + 7/13 - 9/16 - 7/13 + 2/11 - 5/9 + 3/7 - 1/5
C = 1/100 - 1/100 . 99 - 1/99 . 98 - 1/98 . 97 - ... - 1/3 . 2 - 1/ 2 . 1
Tính : A= 3 ( 4^2+1).(4^4+1).(4^8+1) - ( 4^16+1) - 4^32/5
A= 4 x ( 3^2+1 ) x ( 3^4+1 ) x ( 3^8+1 ) x ( 3^16+1 ) và B= 3 ^32 -1
Tìm x:
a, x/1,5 = 4/3
b, 2/9 = x/ -72
c, x : -3/8 = 1/3
1)Tinh 9/10-1/90-1/72-1/56-1/42-1/30-1/20-1/12-1/6-1/2