a)1/5*7+1/7*9+1/9*11+...+2005*2011+1/X=1/5*0,5
b)1-(11 1/2[hon so]+X-10,1)/8 2/5[hon so]=0
c)1-(5 2/9[hon so]+X7 7/18[hon so])/2 1/6[hon so]=0
Giup mik giai bai toan nay,mik tick cho^_^
a,6/7+5/8:5-3/16(-2)2;b,2/3+1/3*(-2/3+5/6):2/3;c,1/1/2x-1/2=3/4;d,-3/5+(-2/5-99)
b,Tim x
a,(2/11+1/3)*x=(1/7-1/8)*56
*luu y:dau gach / la phan so,con so ma co hai dau nhu the nay:vd:7/1/7 la hon so nhe)
1/ E=[3.4.216] / [ 11*213.411-169]
2/ tim X
1+3+5+7+....+X=1600 [ X la so le ]
\(\left(x+\frac{3}{5}\right)^2+1\frac{16}{25}=9\%:4,5\text{%}\)
a)1/5*7+1/7*9+1/9*11+...+2005*2011+1/X=1/5*0,5
b)1-(11 1/2[hon so]+X-10,1)/8 2/5[hon so]=0
c)1-(5 2/9[hon so]+X7 7/18[hon so])/2 1/6[hon so]=0
Bài 1:
1)-7/9x2 3/4
2)2/3+1/3x-2/5
3) 3/4 x 15 1/3 - 3/4 x 43 1/3
4) (-49,1)x 13/27 - 58,9 x 13/27
5) 0,375 : (-4,5)
6) 3 1/7 :( -1 3/7)
7) 9 1/3 :4 2/3 - 2
8) ( 7 3/4 : 0,3125 + 4,5 x2 2/45) : (-8,5)
Bài 2
A= (-6/11) x 7/10 x (11/-6) x(-20)
B= (-1/9) x (-17/29) x 58/51
C=(-3/7) x 5/11 +(-5/14)x5/11
D=(1 1/27 x 12/23 x 9/14 ) :(-3/23)
Bài 3 tìm x
a) 3/7x -2/5 x+-17/33
b)(3/4 x - 9/16).(1/3 +-3/5 : x)=0
c)(x+3/5 ) . (x+1)<0
(Hạn thứ 3 nha , giúp mk vs)
Tính giá trị biểu thức
-5/7 × 2/11 + -5/7 × 9/11
3/5×2/8 + -6/16 × 2/5 + -6/15 : (-16)
Tìm x
X - 2/5 = 0,24
(7/3 × x - 0,6 ) : 3 của 2/5 ( hỗn số ) = 1
Nhanh nha thứ tư thi
1.Tren nua mp bo chua tia Ox,ve cac tia Ox1,Ox2,Ox3,...,OxN sao cho:
xOx2=2xOx1,xOx3=3xOx1,.......,xOxN=NxOx1.tim so N nho nhat de trong cac tia da ve co mot tia la tia phan giac chung cua 2017 goc
2.CMR:neu p la so nguyen to lon hon 3 va 2p+1 cung la so nguyen to thi 4p+1 la hop so
3.So sanh: 63^15 va 34^18
4.tim cac so tu nhien n co hai chu so biet:2n+1 va 3n+1 deu la so chinh phuong
5.CMR: S=16^5+2^15 chia het cho 33
1> Tính
a) 3/11 + 5/-9 + 4/11 - 4/9 + 3/17 + 15/11
b) M = -3 * 4 - 6 * 8 - 9 * 12 - 12 * 16 - 16 * 20 / -1 * 2 - 2 * 4 - 3 * 6 - 4 * 8 - 6 * 10
c) N = 5/7 - 5/9 - 5/11 / 15/7 + 15/9 + 15/11
d) 4 + 4/73 * 1/23 / 5 + 5/73 * 1/23
nhanh lên nha mk đang cần gấp
thanks nha