-314-3.[5+x]=-254
(2545 + 2546) : (2543 x 2542)
\(\frac{254^5+254^6}{254^3.254^2}=\frac{254^3.254^2+254^6}{254^3.254^2}=254^6\)
\(\frac{254^5+254^6}{254^3\cdot254^2}=\frac{254^5\left(1+254\right)}{254^5}=1+254=255\)
( 2545 + 2546 ) : ( 2543 x 2542 )
1.Tính giá trị biểu thức sau
a) 7438 - 64092 : 654 + 149 x 78
b) 37 x ( 8767 - 9996 : 12 ) + 6442
c) 33 + 43 + 53 - 63
d) ( 2545 + 2546 ) : ( 2543 x 2542)
2. Tìm x biết
a) 264 + 12 x = 1800
b) ( x + 73 ) : 19 = 321
c) 2x + 3x + 4x = 18
d) 10 < 2 x < 20 ( x thuộc N )
3/7 + 4/5 + 4/7
3/2 x 4/5 x 2/3
4/6 + 7/13 + 17/9 + 19/13 + 1/9 + 14/6
315/316 x 316 /314 x 316/315 x 317/313
\(\frac{315}{316}\cdot\frac{316}{314}\cdot\frac{316}{315}\cdot\frac{317}{313}=\frac{315.316.316.317}{316.314.315.313}=\frac{1.1.316.317}{1.314.1.313}=\frac{100172}{98282}\)
Ta có : \(\frac{3}{2}\times\frac{4}{5}\times\frac{2}{3}\)
\(=\frac{3}{2}\times\frac{2}{3}\times\frac{4}{5}=1\times\frac{4}{5}\)
\(=\frac{4}{5}\)
Tìm x : {chỉ cần ghi kết quả }
X * 213=3621 b, 314*x=2198 c, 4092:x=314 d, x*71*3=1207*6 e 59*12:x=826:7
a) x = 17
b) x = 7
c) sai de
d) x = 34
e) x = 6
5 + 97 - x + (72 . 45)= 254 + x - 27
5 + 97 - x + (72 . 45)= 254 + x - 27
5 + 97 - x + 3240= 254 + x - 27
- x -x = - 3240 +254 - 27 - 97 - 5
-2x = -3115
x=1557,5
\(5+97-x+\left(72.45\right)=254+x-27\)
\(5+97-x+3240=254+x-27\)
\(-x-x=254-27-5-97-3240\)
\(-2x=-3115\)
\(x=-3115:-2\)
\(x=\dfrac{3115}{2}=1557,5\)
Tìm số nguyên x biết
a) 316 - x = 254
b) 23 + 3x = 56 : 53
c) -3 < hoặc bằng x < hoặc bằng 0
a)
316 - x=254
<=>x=316-254
<=>x=62
b
23+3x=5^6 : 5^3
<=>23 + 3x=5^3
<=>3x=5^3-23
<=>3x=102
<=>x=34
c
\(-3\le x\le0\)
<=>\(x\in\left\{-3;-2;-1;0\right\}\)
a)316-x=254
x=316-254
x=62
b)23+3x=5^6:5^3
23+3x=5^3
23+3x=125
3x=125-23
3x=102
x=102:3
x=34
c) x thuoc{-2;-1;0}
kb cho mik xin kb
2 . ( x + 5 ) + 126 = x + 1000 - 254
2.(x+5)+126=x+1000-254
2.x+10+126=x+746
x+x+136=x+746
=>x+136=746
x=746-136
x=610
chúc bạn học tốt nha
2 . ( x + 5 ) + 126 = x + 1000 - 254
<=> 2 . x + 2 . 5 + 126 = x + 746
<=> 2 . x + 10 + 126 = x + 746
<=> 2 . x + 136 = x + 746
<=> 2 . x - x = 746 - 136
<=> 2 . x - x . 1 = 610
<=> x . ( 2 - 1 ) = 610
<=> x . 1 = 610
<=> x = 610 : 1
<=> x = 610
Vậy x = 610
Tìm x;y;z biết
\(\dfrac{2}{3}x=\dfrac{3}{4}y;\dfrac{1}{5}y=\dfrac{3}{7}z\)và 3x+4y-9z=254