Violympic toán 7
Các câu hỏi tương tự
bài 1: tính
a) -6x+3(7+2x)
b)15y-5(6x+3y)
c) x(2x+1)-x2(x+2)+(x3-x+3)
d)4(x-6)-x2(2+3x)+x(5x-4)3x2(x-1)
bài 2: tìm x
a)3x+2(5-x)=0
b)3x2-3x(-2+x)=36
c)5x(12x+7)-3x(20x-5)=-100
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
Tìm x
a) 2x+3/24 = 3x-1/32
b) x+1/x-2 = 5/6
c) -(x+1)/25 = -4/x+1
d) (5-x).2/25 = -2/x-5
e) x+1/x+4 = x-3/x-2
1Tìm x
a, |x-1| + |x+3|=4
b,|2x+5|-2|4-x|=5
c,|x+3|+|x+1|=3x
d,|2x-3|-x=|2-x|
e,|x-1|+|x-3|+|x-5|+|x-7|=8
f,|x-2010|+|x-2012|+|x-2014|=2
2 Tìm X
|3x-2019|=2019-3x
|x+1|+...+|x+10|=605.x
Tìm x, biết:
1) left|4xright|3x+12 7) left|5xright|-3x-20
2) left|2x+4right|2x-5 8) x-5x+left|-2xright|-30
3)left|x+3right|3x-1 9) left|3-xright|+x^2-left(4+xright)x0
4) left|x-4right|+3x5
5)left|x-5right|3x
6) left|x+2right|2x-10
Đọc tiếp
Tìm x, biết:
1) \(\left|4x\right|=3x+12\) 7) \(\left|5x\right|-3x-2=0\)
2) \(\left|2x+4\right|=2x-5\) 8) \(x-5x+\left|-2x\right|-3=0\)
3)\(\left|x+3\right|=3x-1\) 9) \(\left|3-x\right|+x^2-\left(4+x\right)x=0\)
4) \(\left|x-4\right|+3x=5\)
5)\(\left|x-5\right|=3x\)
6) \(\left|x+2\right|=2x-10\)
a) 2 mũ 3 : |x-2| =2
b) | 2x + 1 | + | 5x -1 | + 7 mũ 4 = 49
c) | x mũ 3 ( x - 4 )= 5x mũ 2
d) | 2x - 5 | = 2 - x
e) x - | x + 1 | = 4
f) 3x + | 4x + 3 | = 5
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:
a) x(1 - 3x) (2x + 4) \(\ge\) 0
b. \(\dfrac{2x+3}{3-x}\le0\)
c. \(\dfrac{x+5}{3+x}>1\)
d. (x2-1)(x2-4)(x2-7)(x2-10) < 0 khi x \(\in\) Z
Tìm x biết:
a. (x - 2).(x + 3/4) > 0
b. (2x - 5).(1 - 3x) > 0
c. (3 - 2x).(x + 1) < 0
d.(5x + 11).(7 - x) < 0
tính giá trị biểu thức
E = 3x - y/2x + 7 + 3y -x/2y - 7 với x - y = 7
F = x2 . (x2 + y2).(x4 + y4).(x6 + y6).(x2 - 2y)/x10 + y10 với x = 6; y = 18
G = (1+2+3+...+60).(x2 + y2).(x3 - y3).(2x-y)/3x -1 với x = 1/5; y = 0,4