Các câu hỏi tương tự
Tính :
B=(x-3)3-(x+3).(x2-3x+9)+(3x-1).(3x+1)
C=(3x+2)3-18x.(3x+2)+(x-1)3-28x3+3x.(x-1)
Rút gọn các biểu thức sau:
a,(3x+1)^2-2(3x+1)(3x-5)+(3x-5)^2
b,(3x^2-y)^2
c,(3x+5)^2+(3x-5)^2-(3x+2)(3x-2)
d,2x(2x-1)^2-3x(x+3)(Õ-3)-4x(x+1)^2
e,(x-2)(x^2+2x+4)-(x+1)^2+3(x-1)(x+1)
f,(x^4-5x^2+25)(x^2+5)-(2+x^2)^2+3(1+x^2)^2
B=(x-3)3-(x+3).(x2-3x+9)+(3x-1).(3x+1)
C=(3x+2)3-11818x18x .(3x3x+2)+(x-1)3 - 28x3+3x.(x-1)
P=(x+3)^3-x.(3x+1)^2+(2x+1)(4x^2-2x+1)-3x^2
Q=(x-3)^3-(x-3)(x^2+3x+9)+6(x+1)^2+3x^2
Tìm x:
a.x^3-3x^2-1=-3x-8
b.x^3+3x^2=26-3x
c.(2x-3)^3-9(x+2)^3=-x^3-99
d.(x+1)^3+2(x-2)^3=3x(x-1)^2-15
rút gọn các biểu thức:
a) (x-2)2-(2x-1)2+(3x-1)(x-5)
b) (x-3)3-(x+3)(x2-3x+9)+(3x-1)(3x+1)
d) (3x – 5)(7 – 5x) – (5x + 2)(2 – 3x) = 4 g) 3(2x - 1)(3x - 1) - (2x - 3)(9x - 1) =0 j) (2x – 1)(3x + 1) – (4 – 3x)(3 – 2x) = 3 k) (2x + 1)(x + 3) – (x – 5)(7 + 2x) = 8 m) 2(3x – 1)(2x + 5) – 6(2x – 1)(x + 2) = - 6
Tìm x :( bài 14 trang 11 sách bồi dưỡng năng lực tự học toán 8)Câu 2 : (2x+3)2+(x-1)*(x+1)5*(x+2)2-(x-5)*(x+1)+(x+4)2Câu 3 : (-x+5)*(x-2)+(x-7)*(x+7)(3x+1)2-(C)*(3x+2)Câu 4 : (5x-1)*(x+1)-2(x-3)2(x+2)*(3x-1)-(x+4)2+(x2-x)Câu 5 : (4x-1)2-(3x+2)*(3x-2)(7x-1)*(x+2)+(2x+1)2-(3x+2)Câu 6 : (2x+3)2-(5x-4)*(5x+4)(x+5)2-(3x-1)*(7x+2)-(x2-1+1)Câu 7 : (1-3x)2-(x-2)*(9x+1)(3x-4)*(3x+4)-9(x+3)2Câu 8 : (3x+4)*(3x-4)-(2x+5)(x-5)+(2x+1)2-(x2-2x)+(x-1)2Câu 9 : (x-7)*(x+1)-(x-3)2(3x-5)*(3x+5)-(3x+1)+(x-2)2-x2Câu...
Đọc tiếp
Tìm x :( bài 14 trang 11 sách bồi dưỡng năng lực tự học toán 8)
Câu 2 : (2x+3)2+(x-1)*(x+1)=5*(x+2)2-(x-5)*(x+1)+(x+4)2
Câu 3 : (-x+5)*(x-2)+(x-7)*(x+7)=(3x+1)2-(C)*(3x+2)
Câu 4 : (5x-1)*(x+1)-2(x-3)2=(x+2)*(3x-1)-(x+4)2+(x2-x)
Câu 5 : (4x-1)2-(3x+2)*(3x-2)=(7x-1)*(x+2)+(2x+1)2-(3x+2)
Câu 6 : (2x+3)2-(5x-4)*(5x+4)=(x+5)2-(3x-1)*(7x+2)-(x2-1+1)
Câu 7 : (1-3x)2-(x-2)*(9x+1)=(3x-4)*(3x+4)-9(x+3)2
Câu 8 : (3x+4)*(3x-4)-(2x+5)=(x-5)+(2x+1)2-(x2-2x)+(x-1)2
Câu 9 : (x-7)*(x+1)-(x-3)2=(3x-5)*(3x+5)-(3x+1)+(x-2)2-x2
Câu 10 : -5(x+3)2+(x-1)*(x+1)+(2x-3)=(5x-2)2-5x(5x+3)
(3x^2-16x) ÷ (-3x) +x(x-4) =-2 (5x^3+20x^2-25x) ÷25x=(x-1) (x+2) (3x+1) ^3=3x+1 x^2-4x+4=9(x-2) Tìm x
1) Rút gọn :
a) ( 3x + 5 ).( 3x - 5 ) + ( 4x - 1 )2 - 25.( x + 1 )2
b) ( x2 - 3x + 1 )2 + 3( x2 - 3x + 1 ).( -x2 + 3x )2 + 3( x2 - 3x + 1 )2.( -x2 + 3x ) + ( 3x - x2)3