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
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
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
6 1/2 - 14 3/7 : 9/13 - 3 4/7 : 9/13
1. Tính
a, 11/15 + - 7/10 + 13/30
b, 7/9 + -1/4 + 3/5
c, -5/21 + -5/14 + 4/35
d, 2/7 + 1/9 + 1/7 + 5/9 + 8/14
e, -4/9 + 8/15 + -2/11 + 5/-9 + 7/15
tính:
a,17-11-14-(-39)
b,125-4[3-7(-2)]
c, (-2)^7:(-2)^4+8
d,(-14).9-13.(-9)
Bài 1: Tính:
A= ((2^12 . 3^5 - 4^6 . 9^3 ) / 9( 2^2 . 3 )^6 + (8^4 . 3^5))) - ((5^10 . 7^3 - 25^2 . 49^2) / (( 125 . 7 )^3 + 5^9 . 14^3))
B= (2^9 . 27^3 + 15 . 4^9 . 9^4) / (6^9 . 2^0 + 12^10)
Đưa thừa số chung ra ngoài 4 1/3 . 4/9 + 13 2/3 . 4/9 B, 5 1/4 . 3/8 + 10 3/4 . 3/8 C, 6 1/5.(-2/7)+ 14 4/5 . (-2/7)
\(\dfrac{-2}{7}-\dfrac{1}{4}\)
\(\dfrac{-1}{2}.\dfrac{4}{9}+\dfrac{3}{7}\div\dfrac{15}{14}\)
\(\left(\dfrac{-3}{4}+\dfrac{7}{10}\right)\div\left(\dfrac{-1}{5}\right)-\dfrac{2}{9}\)