\(\dfrac{-7}{3}:\dfrac{14}{9}=\dfrac{-7}{3}.\dfrac{9}{14}=\dfrac{\left(-1\right).3}{2}=\dfrac{-3}{2}\)
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\(\dfrac{-7}{3}:\dfrac{14}{9}=\dfrac{-7}{3}.\dfrac{9}{14}=\dfrac{\left(-1\right).3}{2}=\dfrac{-3}{2}\)
bài 1 tính
a) (3/7+-9/8)+(5/8+-6/14)
b) (-5/7+3/11)+(-11/14+14/-11)
c)(-4/5+2/3)+(-5/4+19/5)+(7/3.2)
d)9/16.13/4-9/4.5/16+9/16.17/4
\(\dfrac{-3}{7}.\dfrac{14}{-9}+\dfrac{-3}{7}.\dfrac{5}{9}\)
So sánh A và B :
\(A=\frac{7^{15}}{1+7+7^2+7^3+7^4+...+7^{14}}\)
\(B=\frac{9^{15}}{1+9+9^2+9^3+9^4+...+9^{14}}\)
Mk đang cần gấp
Ai nhanh Thì Tick
Bài 1 : Tính một cách hợp lí
A = -3/7 + 14/23 + -14/17 +9/23 - 5/19
B= 5/9 . 7/13. 5/9 .9/13 . -5/13. 3/9
Giúp mình với!!!
6 1/2 - 14 3/7 : 9/13 - 3 4/7 : 9/13
2/7+1/9+3/7+5/9+8/14= ?
tìm x:
x-3/7:9/14=-7/3
4)(3 1/2 + 2x) : 3/14 = 7/12
5)1/4 + 1/3 : (3x) = -5
6)2 7/9 - 3/4 (x+1) = 7/9