x+x nhân 1/4:2/7+x:2/9=255
Biết X + X x 1/4 : 2/7 + X : 2/9 = 255
1 1/21 : < 15,75 - 15 1/5 > + 2 1/12 : < 7 3/4 - 7,25 >
a, 7/x = 3/12 b, X +X x 1/4 : 2/7 + X : 2/9 = 255
chú ý
/ là phần
a) x- 6/7 = 5/2
b) 12/7 : x + 2/3 _ 7/5
c) 2/3 . x + 3/4 = 3
d) 720 : [ 41 - ( 2x -5 )]= 120
e) x + x . 1/4 : 2/7 + x : 2/9 =255
Tìm x : bt
a , 22/7 : ( 11 - x ) + 2/3 = 7/5
b , 22 * ( x + 1 ) - 12,5 = 53,5
c , ( x - 1/2 ) * 5/2 +1/2 = 7/4
d , x + x * 1/4 : 2/7 + x : 2/9 = 255
Bài 1: Tìm x, biết:
a) 24 . x - 32 . x = 145 - 255 / 51
b) 580 / ( x - 24 ) = 329 - 150 . 2
c) 7. ( x - 14 ) + 35 = 25 + 279 / 9
thanks
1, tinh tong
a, S = 1+2-3-4+5+6-7-8+...-100+101
b,C= 1.2+2.3+...+99.100
c, 1.2.3+2.3.4+...+98.99.100
2,tim so tu nhien x
a, 2+4+6+... +2x=210
b,x + (x-1)+(x-2)+...+(x-50)=255
c, (x+1)+(x+2)+...+(x+100)=5700
3,
S1 =1+2
S2=3+4+5
S3=6+7+8+9
hay tinh S99= ??
a)7/x=3/12 tìm x
b) y+yx1/4:2/7+y:2/9=255 tìm y
Ai biết làm thì ghi cách làm cho mik nhé
tìm x
a) X x 3/4 = 1/5 b) 3/7 x X = 2/5 c) 1/3 + 2/9 = 2/12 x X
d) 4/15 x X - 2/3 = 1/5 e) x : 1/7 = 2/3 f) 1/9 : x = 7/3 j) 1/4 + 5/12 = 8/3 : x
h) 7/4 : X - 1/2 = 1/5