Tìm x:
1/ 4.(18-5x)-12.(3x-7)=15.(2x-16)-6.(x+14) 2/5.(3x+5)-4(2x-3)=5x+3.(2x+12)+1 3/2.(5x-8)-3(4x-5)=4(3x-4)+11 4/5x-3.{4x-2.[4x-3(5x-2)]}=182Tìm x:
a,(x+2).(x+3)-(x-2).(x+5)=6
b,3.(2x-1).(3x-1)-(2x-3).(9x-1)=0
c,5x-3{4x-2[4x-3.(5x-2)]}=182
1.Thuc hien phep tinh sau:
a,(3x^2-4x+5)(2x^2-4)-2x(3x^3-4x^2+8)
b,(1-3x+x^2)(2-4x)+2x(2x^2+5)
a, 5*(4x-1)+2*(1-3x)-6*(x+5)=10
b, 2x*(x+1)+3*(x-1)*(x+1)-5x*(x+1)+6x mũ 2 = 0
c, 4*(x-1)*(x+5)-(x+2)*(x+5)-3(x-1)*(x+2)=0
d,2*(5x-8)-3*(4x-5)=4*(3x-4)+11
Bài 3: Chứng tỏ các biểu thức sau không phụ thuộc vào giá trị của biến
1. 2x(2 + 5x) – 4x(1 + 2x) – (2𝑥 2 + 3)
2. 6(𝑥 2 – x – 1) – (2x – 3)(3x + 1)
Tìm x, biết
a) 4(x+2) - 7(2x-1) + 9(3x-4) = 30
b)2(5x-8) - 3(4x-5) = 4(3x-4) + 11
c) 4x2 + 3(2x2+1) = 2x(5x-7)
d) x(x2-7) = 2x(\(\dfrac{1}{2}\)x2+6) + 8
1 -4( -x+5) + 9x - 1= 4x + 7 - 2x +3
2) 9x -3( 2x +1) +3x - 3 = 3x
16 Tìm x, biết
a) 4(x+2)-7(2x-1)+9(3x-4)=30 ; b) 2(5x-8)-3(4x-5)=4(3x-4)+11
c) 5x(1-2x)-10(x+8)=0 ; d) (5x-3).4x-2x.(10x-3)=15
Thực hiện phép tính :
a)5x2 - 3x . (x-2)
b) 3x.(x-5)-5x.(x+7)
c) 5x.(1/5x-2)=3.(6-1/3x2)
d) 7x.(x-5)+3.(x-2)
e) 5-4x.(x-2)+4x2
f)4x.(2x-3)-5x.(x-2)