Ta có: 3x+2+4.3x+1=7.36
=> 3x + 1.(3 + 4) = 7.36
=> 3x + 1 . 7 = 7.36
=> 3x + 1 = 36
=> x + 1 = 6
=> x = 5
3.3x+1 + 4.3x+1 = 7.36
3x+1(3 +4) = 7.36
x+1 = 6
x = 5
Đang cần gấp
A/4.3x-12.3x+2=4.36+2.39
B/1/5.2x+1/3.2x+1=1/5.27+1/3.28
BT2: Tim x
\(1.\left(3x+1\right)^2=25\)
\(2.\left[x-\frac{1}{2}\right]+\frac{1}{2}=\frac{5}{8}\)
\(3.\left[x+\frac{3}{4}\right]-\frac{1}{3}=0\)
\(4.\frac{1}{9}.3^4.3x=3^7\)
\(5.\frac{x}{5}=\frac{4}{21}\)
Cho R(x) = 2x 2 + 3x - 1; M(x) = x 2 - x 3 thì R(x) - M(x)=
A.-3x 3 + x 2 + 3x – 1 B. -3x 3 - x 2 + 3x – 1
B. 3x 3 - x 2 + 3x – 1 D. x 3 + x 2 + 3x + 1
Bài 2 Tìm x biết 1, (2x-2).(3x+1)-(3x-2).(2x-3)=5 2,(1-3x).(3x-5)-(2x-4)(2-3x)=x-6 3,(2x-1).(4x^2+2x+1)-(2x+1)(4x^2-2x+1)=5x+6 Giúp tớ với
b1:
[4+2x]=-3x [3x-1]+2=x
[x+15]+1=3x [2x-5]+x=2
b2:
[2x-5]=x+1 [3x-2]-1=x
[3x-7]=2x+1 [2x-1]+1=x
làm tính chia:
a)( x^2 +3x -2):(x-1)
b) (3x^2-3x+1):(x+2)
Thu gọn đa thức sau
Q=x^2 + 2xy - 3x^3 + 2y^3+3x^3-y^3
P=1/3x^y+ xy^2-xy+1/2xy^2-5xy-1/3x^2y
Tìm nghiệm : a) (2x-3).(2x+3) B)(x-4).(x-1).(x-2) C)2x(3x-1)-3x(5+2x) D)(3x-2).(3x+2)-4.(x-1)
B1. Tính giá trị: A=(x+2)^2 - (x-2)^2 với x=125
B2. Thu gọn:
a, 2x.(2x-1)^2 - 3x.(x+3).(x-3) - 4x.(x+1)^2
b. (3x+1)^2 - 2.(3x+1).(3x+5) + (3x+5)^2
B3: Tìm x biết (x+2)^2 - x^2 +4=0
1) Tìm x,biết :
a) 3/2 . |x-5/3| - 4/5 = 4/3 . |x-5/3| + 1
b) 2.|3x +1| = 1/3 . |3x + 1| +5
c) 1/4 - 5/2 . | 3x - 1/5| = 2/3. |3x - 1/5| - 2/3
