\(3\times\frac{24}{13}+2\times\frac{3}{13}=\frac{72}{13}+\frac{6}{13}=\frac{78}{13}=6\)
3x24/13+2x3/13
=3x8x3/13+2x3/13
=24x3/13+2x3/13
=3/13x(24+2)
=3/13x26
=6
Tìm x, biết: a) x = 1/4 + 5/13 b) x/3 = 2/3 + -1/7 c) x/3 = 16/24 + 24/ 36
d) x/15 = 1/5 + 2/3
Tim so nguyen x biet:
a,x-(-24)=3
b,(x+5)-(x-9)=x+3
c,c(x+2)=0
d,(x-1)^2=0
e,x^2-3x=0
f,-13-(6-|x+1|)=24
g,26-|x+9|=-13
i,(3x-6).3=3^4
x + (x+1) + (x+2) + (x+3) + .... + 13 + 14 = 14
25 + 24 + 23 +...+ x + (x - 2) + (x – 3) = 25
1/4.12/13+1/4.1/13-12%
*Tìm x bt
a, |2/5:x |=1/4
c,x/24=-1/3-1/8
d, 3/x+3=-7/21
3 ( x - 2 ) + 150 = 204
( x - 13 ) : 5 = 12
24 + 3 ( 5 - x ) + 27
Tìm y:
a, y - 6 : 2 - ( 48 - 24 x 2 : 6 - 3 ) = 0
b, ( 7 x 13 + 8 x 13 ) : ( \(9\frac{2}{3}\)- y ) = 39
a) x/8 = 3/4 + -5/8
b) x/12 = 3/4 + -2/3
c) 1 + 11/13 = 24/x
d) x/6 - 3/4 = 1/12
Tìm x
a -2.(x+6)+6.(x10)=8
b -4.(2x+9)-(-8x+3)-(x+13)=0
c7x.(2+x)-7x.(x+3)=14
d 3.|x-2|+2x=19, với x >hoặc =2
e 2.|3-x|-5x=-24 với x > hoặc= 3
f |x+11|+|13-x|=0
-4(5-x)=-3(6-x)
-3(x-8)-(2x-7)=35
2. Tính tổng
1+(-2)+3+(-4)+...+49+(-50)
1-2+3-4+...+99-100
2-4+6-8+...+49-50
Tính hợp lý
24(16-5)-16(24-5)
29-(19-13)-19(29*13)
31*(-18)+31*(-81)-31
(-12)*47+(-12)*52+(-12)
13(23+22)-3(17+28)
