Đại số lớp 7
Các câu hỏi tương tự
Bài 2:Tìm x,biết:
1, 4/5-x=1/3
2, 2/3+5/3x=5/7
3, -12/13x+5=5 1/13
4, x:(-2 1/4)+1,5=-3/4
5,GTTĐ của x -3/4 - 1/4=0
6, 6-GTTĐ của 1/2-x = 2/3
7, (x-1)2=4/9
tìm x,y thuộc z sao cho:
a, 1/x = 1/6 + y/3
b, x/6 - 1/y = 1/2
c, x/4 - 1/y = 3/4
d, x/8 - 2/y = 3/4
e, x/4 - 2/y = 3/2
f, 1/x - 1/y = 1/x . 1/y
1. So sánh:
a) 25^50 và 2^300
b) 625^15 và 12^45
2. Tính hợp
a) -4 5/7 . 33 1/3 + 4 5/7 . 47 . 1/3
b) (3/5 + 5 2/3 ) : 121/19 + ( -5 2/3 + 2/3 ) : 121/19
c)( -1/4) . ( 6 2/11) + 3 9/11 . (-1/4)
d) 4 . ( -1/3)^3 - 2 . ( -1/2)^2 + 3. (-1/2) +1
3. Tìm x
a) GTTĐ của x - 2 = 5
b) 3x . ( x - 2/5) = 0
c) 3 ^x+2 +3^x = 270
d) 3/4 + 1/4 :x = 2/5
e) (9/5 - x)^2 = 16/25
Tìm x biết :a) left[left(6frac{3}{5}-3frac{3}{14}right).2,5right]:left(21-1,25right)x:5frac{5}{6}b) left(4-frac{3}{4}right):left(2frac{1}{3}-1frac{1}{9}right)31x:left(45frac{10}{63}-44frac{25}{84}right)c) frac{x-1}{x+5}frac{6}{7}d) frac{x^2}{6}frac{24}{25}e) frac{x-2}{x-1}frac{x+4}{x+7}giúp mình nhé
Đọc tiếp
Tìm x biết :
a) \(\left[\left(6\frac{3}{5}-3\frac{3}{14}\right).2,5\right]:\left(21-1,25\right)=x:5\frac{5}{6}\)
b) \(\left(4-\frac{3}{4}\right):\left(2\frac{1}{3}-1\frac{1}{9}\right)=31x:\left(45\frac{10}{63}-44\frac{25}{84}\right)\)
c) \(\frac{x-1}{x+5}=\frac{6}{7}\)
d) \(\frac{x^2}{6}=\frac{24}{25}\)
e) \(\frac{x-2}{x-1}=\frac{x+4}{x+7}\)
giúp mình nhé 
5) (x– 5)(x – 1) (x – 1)(x – 2)6) 6(х - 3)(х — 4) - 6х(х — 2) 47)-(x + 3)(x – 4) + (x + 1)(x – 1) 108) (2x – 1)(x – 2) – (x + 3)(2x – 7) 39) (х - 5)(4 — х) — (х — 1)(х + 3) -2x^210 (4x + 1)(x – 3) - (x- 7)(4x – 1)1511) (x + 1)(x² – x + 1) – x(x² – 3) 412) (x – 3)(x² + 3x+9)+ x(5 – x²?) 6x13) (3x – 5)(x + 1)– (3x – 1)(x+ 1)x - 414) 5(x – 3)(x – 7)– (5x+ 1)(x – 2) 8
Đọc tiếp
5) (x– 5)(x – 1)= (x – 1)(x – 2)
6) 6(х - 3)(х — 4) - 6х(х — 2) = 4
7)-(x + 3)(x – 4) + (x + 1)(x – 1) = 10
8) (2x – 1)(x – 2) – (x + 3)(2x – 7) =3
9) (х - 5)(4 — х) — (х — 1)(х + 3) = -2x^2
10 (4x + 1)(x – 3) - (x- 7)(4x – 1)=15
11) (x + 1)(x² – x + 1) – x(x² – 3) = 4
12) (x – 3)(x² + 3x+9)+ x(5 – x²?) = 6x
13) (3x – 5)(x + 1)– (3x – 1)(x+ 1)=x - 4
14) 5(x – 3)(x – 7)– (5x+ 1)(x – 2)= 8
c) 7/23 x [(-8/6) - 45/18]d) 23 1/4: 7/5 - 13 1/4 : 5/7e) 25 x 153 / 63 x 102l) (1/3)10 x (9)25 - (2/3)10 : (4/9)5i) (-5)7 x (-1/5)7 + 0.56 x (-2)6
Đọc tiếp
c) 7/23 x [(-8/6) - 45/18]
d) 23 1/4: 7/5 - 13 1/4 : 5/7
e) 25 x 153 / 63 x 102
l) (1/3)10 x (9)25 - (2/3)10 : (4/9)5
i) (-5)7 x (-1/5)7 + 0.56 x (-2)6
a. 5.2x+1.2-2=384
b. 3x+2.5y=45x
c. (x+1)x+1=(x+1)x+3
tìm x biết
1) |x+1|+|x-2|+|x+3|=6
2) |1-x|+3|x-3|-2|x-2|=x
3) |x+1|+|x+2|+|x+3|=4x
4) |x+1|+|x+2|+|x+3|+|x+4|=5x+1
5)||2x-3|-x+1|=4x-1
18 tháng 2 2022 lúc 15:41
Cho đa thức f(x) = ax + 5. Tìm a biết
1. f(1) = 3
2. f(-3) = -2
3. f(-1) = 4
4. f(1/2) = 4
5. f(-2/3) = 1
6. f(3/4) = 2