\(2x-7=-2\)
\(2x=-2+7\)
\(2x=5\)
\(x=\frac{5}{2}\)
\(2.x-7=-2\)
\(\Rightarrow2.x=-2+7\)
\(\Rightarrow2.x=5\)
\(\Rightarrow x=\frac{5}{2}\)
\(2\cdot x-7=-2\\ =>2x=-2+7\\ =>2x=5\\ =>x=5:2\\ =>x=2,5\)
2x-7=-2
2x=-2+7
2x=5
x=\(\frac{5}{2}\)
dễ mà
\(2x-7=-2\)
\(2x=-2+7\)
\(2x=5\)
\(x=\frac{5}{2}\)
\(2.x-7=-2\)
\(\Rightarrow2.x=-2+7\)
\(\Rightarrow2.x=5\)
\(\Rightarrow x=\frac{5}{2}\)
\(2\cdot x-7=-2\\ =>2x=-2+7\\ =>2x=5\\ =>x=5:2\\ =>x=2,5\)
2x-7=-2
2x=-2+7
2x=5
x=\(\frac{5}{2}\)
dễ mà
Tìm x, biết:
a) x(x+5).(x-5) - (x+2).(x2- 2x+4)=17
b) (3x-5).(7-5x) - (5x+2).(2-3x)=4
c) 6x2 - (2x+5).(3x-2)=7
d) x(x-4) - (x2-8) = 0
a) 2(x-1)2+(x+3)2=3(x-2)(x+1)
b) (x-1)2+(x-2)2=2(x+4)2-(22x+27)
c) x3-5x2+12x-5=0
d) (2x-1)2+(x+3)2-5(x+7) (x-7)=0
tìm x
a) (x-5)(x+5) = (x-2)
b) (3-2x)2 - (x-5)(4x+3)= 2(x+5)
c) (7-x)(2x-5)-(7-x)2x= 3(-5+x)
rút gọn biểu thức
a)(2x-3)(x-2)
b)2x(5-3x)-3(x-7)
c)3x(2-3x)+3x(3x-2)-5(x-7)
Bai1:tìm x biết.
a)4×(x-5)-(x-1)×(4x-3)=5
b) (3x-4)×(x-2)=3x×(x-9)-3
c)(x-5)×(x-4)-(x+1)×(x-2)=7
d)(2x-1)×(x-2)-(x+3)×(2x-7)=3
tìm x biết
3(x+2)^2+(2x-1)^2-7(x+3)(x-3)=32
2)
a) x2+2y2 +2xy - 2x +2 = 0
b) (2x-1)2 + (x+3)2 -5(x-7)(x+7)=0
c) x2 - x + 1/4 = 0
giải phương trình :
(x+3/x-2)+6-(x-3/x+2)2-7(x2-9)/x2-4=0
Phân tích các biểu thức sau thành các nhân tử
A=(x2+4x+10)2 - 7(x2 +4x+11)+7
B=(x2-3x+5)2 + 7x(x2-3x +5) + 12x2
Tìm x, biết:
a) 4x2-12x=-9
b) (5-2x)(2x+7)=4x2-25
c) x3+27+(x+3)(x-9)=0
d) 4(2x+7)2-9(x+3)2=0