tính
a, 7/-25 + -18/25 + 4/23 +5/7+19/23
b, 7/19 x 8 /11 + 7/19 x 3/11 + 12/19
c ,day la hon so nha: 8 2/7 -(3 4/7 + 4 2/7 )
d, -7/9 .3/11 + -7 /9.8/11 + 1 7/9
GIẢI HỘ VS BẠN ƠI!!!!!!!!!!
a = 5 x 7 + 7 x 9 + 9 x 11 + 11 x 13 + 13 x 15 + 15 x 17 + 17 X 19 + ... + 99 x 101
\(\frac{3}{11}\cdot\frac{7}{19}+\frac{17}{11}\cdot\frac{3}{19}-\frac{3}{19}\cdot\frac{25}{11}\)
A, 7 x - x = 5^21 : 5^19 + 3 . 2^2 - 7^0
B, 6 x + x = 5^11 : 5^19 + 3^1
C, 7 x - 2x = 6^17 : 6^15 + 44:11
a,-8/3+7/5+-71/15<x<-13/7+19/14+-7/2
b,-19/6+-15/2+11/3<x<-5/4+19/12+-10/3
c,-6/7+3/35<x<-2/5+3/7
d,x=3/4+1/-12
e,x/14=1/7+-3/14
f,11/18+13/6=85/x
g,8/17+5/17<x/17<6/17+9/17
A=\(\frac{7}{19}x\frac{8}{11}x\frac{7}{19}:\frac{3}{11}+\frac{12}{19}\)
A=\(\frac{7}{19}x\frac{8}{11}x\frac{7}{19}:\frac{3}{11}+\frac{12}{19}\)
tính (1+2+4+7+11+.............+21) -(1 x 19 + 2 x 18 + 3 x 17 + .....+19 x 1)
giúp mình nha mình tk cho
tìm tập hợp x thuộc Z
a,19-(x+11)>=25
b,-160-7x<3x+30
c,|x-3|+17>19
d,-14+|15-x|<=16
