\(\frac{3x+2}{5x+7}=\frac{3x-1}{5x+1}\)
=> \(\left(3x+2\right)\left(5x+1\right)=\left(3x-1\right)\left(5x+7\right)\)
=> \(15x^2+3x+10x+2=15x^2+21x-5x-7\)
=> \(\left(15x^2-15x^2\right)+\left(3x+5x+10x-21x\right)=-7-2\) (chuyển vế)
=> \(-3x=-9\Rightarrow x=\frac{-9}{-3}=3\)
3x+2/5x+7=3x-1/5x+1
3x+2/5x+7=3x-1/5x+1
3x+2\5x+7=3x-1/5x+1
Tìm x
Giá trị x thỏa mãn 3x+2 / 5x+7=3x-1 / 5x+1
Bài : Rút gọn
1) (3x - 5).(7-5x)-(5x+2).(2-3x)
2) (3x2+5x-2).(2x2-4x+3)
3) (3x2+5x-2).(2x2-4x+3)
4)4(2x3+x)-(2x-1)(4x2+3x+1)
5) 2x(x+3)-(x-5).(7+2x)
Nhanh + đúng auto tick :Đ!
Tìm x biết :
a, 4.(18 - 5x) - 12.(3x - 7) = 15.(2x - 16) - 6(x + 14)
b, 5.(3x + 5) - 4.(2x - 3) = 5x + 3.(2x + 12) + 1
c, 2.(5x - 8) - 3.(4x - 5) = 4.(3x - 4) + 11
d, (3x + 2)(2x + 9) - (x + 2)(6x + 1) = (x + 1) - (x - 6)
e, (8x - 3)(3x + 2) - (4x + 7)(x + 4)= (2x + 1)(5x - 1) - 33
mọi người giúp mình với |x+1/3| + 4 =1;|3x-7|+7=3x;|5x-2|+5x=2
*Dạng 2: Đa thức BT1: Thực hiện phép tính a) 3x(x^2-5x+7) b) (x+4)(-x^2+6x+5) c) (3x-1)(3x+5)-7(x^2+2) d) (-5x^5 + 2x^4 - 1/3x^3): (-1/2x^3)
CMR:
a) 3x+2/5x+7=3x-1/5x+1
b)x+1/2x+1=0,5x+2/x+3
