Violympic toán 7
Các câu hỏi tương tự
\(\dfrac{7^{x+2}+7^{x+1}+7^x}{57}=\dfrac{5^{2x}+5^{2x+1}+5^{2x+3}}{131}\)
tim x
c)5^x+1-5^x=20 c)2^x+2^x+4=544 c)4^2x+1+4^2x=80 c)3^2x+2+3^2x+1=108 c)7^x+3-7^x+1=16464
Tìm x,biết:
1) |x+2| + |x-5| = 7
2) |x-7| + 2x+5 =6
3) |2x + 1| +|x+3| = 4x
4) |x2 -2x| = x
5) |2x+3| = x+2
6) |5x-4 |= |x+2|
7) |x-2| - |2x - 3| - x = 2
a) / 2x- 3 / > 5
b) / 3x - 1 / ≤ 7
c ) / 3x -5 / + / 2x + 3 / = 7
tìm x
a, | 5/4x - 7/2 | - | 5/8x + 3/5 | = 0
b, 21/5 + 3 : | x/4 - 2/3 | = 6
c,| 9 + x | = 2x
d, | 2x - 3 | + x = 21
e, | 7 - 2x | + 7 = 2x
f, | -x + 2/5 | + 1/2 = 3,5
G, | 3x - 4 | + 4 = 3x
Câu 10:Tìm biết
Trả lời
Bài 2 Tìm x biết :
a) -5 | x - 3 | + | 1/2x + 4 | = 7|
b) | 2x + 1 | - 4 | 5 - x | = 9
c) | 9 - | x | = 8
d) - | 2x + 4/3 | - 11 - x | = -7/3
Tìm x, biết:
a)/ 3x - 2 / - x = 7
b)/ 2x - 3 / > 5
c/ / 3x - 1 / ≤ 7
d) / 3x - 5 / + / 2x + 3/ = 7
\(\frac{2x+1}{5}=\frac{3y-2}{7}=\frac{2x+3y-1}{6x}\left(2x+3y-1\ne0\right)\) Tìm x