Các câu hỏi tương tự
tính nhanh:1/34+1/45+1/56+..............+1/11x22
Tính:
a) 2^5 x 13^12 x 7^8 : 27 x 13^10 x 7^9
b) 2^n x 11 x 3 : 6^n x 3
c) 5^5 x 7 x 9^5 : 15^10
d) 7 x 8^10 x 27^9 - 8 x 9^13 x 2^27 : 7 x 6^26 x 2^2 - 2^4 x 8^3 x 27^9
e) 2^2^1^2015
f) 2015^0^2015^0^2015
câu 3 ta có frac{x}{-3}y/5 xfrac{-3y}{5}thay x -3y/5 vào xy-5/27 ta được-frac{-3y}{5}*y-5/27frac{-3y^{^2}}{5}-5/27.-3y^2 -5/27 :5-5/27*1/5 -3y^2-1/27y^2 -1/27 :(-3)-1/27*(-1/3)1/81y1/9Khi đó x -5/27 : 1/9 -5/27 *9 -5/3vậy x -5/3 ,y 1/9
Đọc tiếp
câu 3
ta có \(\frac{x}{-3}\)=y/5 => x=\(\frac{-3y}{5}\)
thay x= -3y/5 vào xy=-5/27 ta được
-\(\frac{-3y}{5}\)*y=-5/27
=>\(\frac{-3y^{^2}}{5}\)=-5/27
=>.-3y^2 =-5/27 :5=-5/27*1/5
=> -3y^2=-1/27
=>y^2 =-1/27 :(-3)=-1/27*(-1/3)=1/81
=>y=1/9
Khi đó x= -5/27 : 1/9 = -5/27 *9 = -5/3
vậy x= -5/3 ,y = 1/9
6. 27/35 x 5/9 - 2/7 x -7/5
7. 10/13 x 13/5 + {-9/5} x 10/3
8. 100/27 x 9/20 + 40% x 5/3
9. 1,5 x 5/12 + 1/4 x 3/4
Tính:
a) 2^5 x 13^12 x 7^8 : 2^7 x 13^10 x 7^9
b) 2^n x 11 x 3 : 6^n x 3
c) 5^5 x 7 x 9^5 : 15^10
d) 7 x 8^10 x 27^9 - 8 x 9^13 x 2^27 : 7 x 6^26 x 2^2 - 2^4 x 8^3 x 27^9
e) 2^2^1^2015
f) 2015^0^2015^0^2015
1) 27,56 x 35 + 27,56 x67- 27,56 x2
2) 4 x 35 x 25 x 5 x2
3) ( 32 x 18 - 16 x 36 ) x( 1+3+5+7+......+1001)
4) 3/5 + 2/5 x 1/2 - 2/3 x 3/4
5) 27 x 13 + 35 x 27 - 12 x 9
6) 33/5 x 15/11 + 22/27 x 81/44 - 3/5 : 9/5
-3x + 24 = -24
17 - 2x = -15
54 : ( x + 2) = -6
12 . ( 3 - x ) = 72
-3. ( x + 5) + 18 + -27
( x + 5 ) 2 = 9
( 3 - x )3 = 27
cần gấp ạ
trl đúng sẽ tick
1. -2/9 x 15/17 + -2/9 x 2/17
2. -5/3 x 6/5 + -7/9 x 3/10
3. 15/20 x 7/5 + -9/7 x -6/4
4.-25/13 x 5/19 + -25/13 x 14/19
5 -7/13 x 13/5 + -9/7 x 5/3
6. 27/35 x 5/9 - 2/7 x -7/5
7. 10/13 x 13/5 + {-9/5} x 10/3
8. 100/27 x 9/20 + 40% x 5/3
9. 1,5 x 5/12 + 1/4 x 3/4
10. 2 1/2 x 7/5 + {-9/10} x 2/3
11. X + 45% = 2 1/2 -5/3
12. 80% + X = -5/2 + 3/4
13. 4/25 - X =-5/2 + -3/10
18 tháng 7 2023 lúc 14:51
9 < 3 x < 27