1/4 : 1/x = 1/20
1/x = 1/4 : 1/20
1/x = 1/5
Từ trên suy ra x = 5
Ta có : 1/4:1/x=1/20
1/x=1/4:1/20
1/x=5
<=> 1:x=5
x =1:5
Vậy : x =1/5
1/4 : 1/x = 1/20
=> 1/x = 1/20 : 1/4
=> 1/x = 1/20 x 4
=> 1/x = 1/5
=> x = 5
1/4 : 1/x = 1/20
1/x = 1/4 : 1/20
1/x = 1/5
Từ trên suy ra x = 5
Ta có : 1/4:1/x=1/20
1/x=1/4:1/20
1/x=5
<=> 1:x=5
x =1:5
Vậy : x =1/5
1/4 : 1/x = 1/20
=> 1/x = 1/20 : 1/4
=> 1/x = 1/20 x 4
=> 1/x = 1/5
=> x = 5
Find x , if
x : 3 + 1 - 2 + 3 - 4 + 5 - 6 + ... + 97 - 98 + 99 = 127
the area of the rectangle is x if the length of the rectangle is increased by 20% and the width of the rectangle is decreased by 10%, the area of the rectangle is increased by 20 m2 find x
Bài 1 Tìm x biết
a) (x+1/2)+(x+1/4)+(x+1/8)+(x+1/16)=1
b) x- 20/11x13-20/13x15 -...-20/53x55=3/11
1) Tìm x
a) (1/4 x X - 1/8) x 3/4 = 1/4
b) 12/5 : X = 14/3 x 4/7
c) x + 2/3 = 8 : 4 - 1
2) Thực hiện phép tính:
a) (1/5 + 3/4) x 1/2
b) 13/20 - (1/4 - 5/20)
c) 1/10 + 4/20 + 9/30 + 25/50 + 36/60 + 49/70 + 64/80 + 81/90
d) 2/3.5 + 2/5.7 + 2/7.9 + ... + 2/41.43
1 find all x such that 2.91 < x < 11.34 and x is a even number
2 the area of a rectangle is 70m2 . If its length is increased by 10% and its width is decreased by 20% then the area of the new rectangle is ...... m2
3 Peter counts his heart rate . He counts 8 beats per 6 seconds on average . How many beats per minute does Peter count ?
Tính nhanh :
70/3 x ( 39/30 + 39/42 ) - 246/7 : ( 41/56 + 41/72 )
57/20 - 26/15 + 139/20 : 3
39/4 + 2/3 x ( 11 - 23/4 )
( 1 - 1/2 ) x ( 1 - 1/3) x ( 1 - 1/4 ) x ....( 1 - 1/2004 )
Tìm x , biết
a) { x + 1/2 } + { x + 1/4 } + { x + 1/8 } + { x + 1/16 } = 1
b) x - 20/11.13 - 20/13.15 - ... - 20/53.55 = 3/11
Dấu . là dấu nhân các bạn nhé
( 1/2 + 1/6 + 1/12 + 1/20 ) × ( 20 - x ) = 4
Tìm x
( 1+1/2)x(1+1/3)x(1+1/4)x...x(1+1/20)