X x 14 - 13 x 2 = 1,473684211
X x 14 - 26 = 1,473684211
X = (1,473684211 + 26) : 14
X = 27,473684211 : 14
X = 1,962406015
X x 14 - 13 x 2 = 1,473684211
X x 14 - 26 = 1,473684211
X = (1,473684211 + 26) : 14
X = 27,473684211 : 14
X = 1,962406015
X x 14-13 x 2= 112:76
Tìm x, biết: x + 2/7=1/2
A.x= 3/14 B. x=2/14 C. x=13/3 D. x=1/5.
Tìm X :
14 x X + 25 x X - 13 x X = 52
Tìm x biết:
a) (19x + 2 . 52) : 14 = (13 - 8)2 -42
b) x + (x + 1) + (x + 2) + .....+ (x + 30) = 1240
bài 1 thực hiện phép tính
( 4/5 + 3/10- 1/5 ) x6 :4/7
2007x 76 - 75 x 2007 - 2007
( 47,5 +8,6x 4,5 - 105)
bài 2 tìm x
a) x: 2/5 = 10
75% +30% x =4
( 9 xX + 2)x 3 -47=13
Tính nhanh
57 x 76 + 13 x 57 + 11 x 57
Tìm x. a,x/21 = 1/2 b,2/x = 3/14 c,13/9 = x/18
1: Tính nhanh :
a) 437 + 541 + 463 - 341
b) 562 + 389 - 462 + 611
c) ( 417 + 536 ) + ( 583 - 436 )
d) 325 x 6 + 6 x 560 + 115 x 6
e)133 : 7 + 154 : 7 + 413 : 7
f) 2 x 13 x 5 x 4 x 17 x 25
g) 125 x 36 x 8
h) 28 x 14 x 25
i) 125 x 31 x 72
k) 417 x 28 - 28 x 317 + 5200
l) 3 x 78 x 8 + 6 x 22 x 4 - 24 x 10
m) 3 x 128 x 12 - 4 x 28 x 9 + 18 x 100 x 2
n) 50 x 76 + 25 x 18 - 14 x 125
x*2+x*8=76
tìm x