b)x+3=4:2
=> x=-1
d)5x-15=3x-5
<=> 5x-3x=15-5
<=> 2x=10
<=> x=5
f) 35-7x=11-5x
<=> 35-11=-5x+7x
<=> 24=2x
<=> x=12
h) 6x-2-3x=10
<=> 3x=10+2
<=> x=4
j)3-2x=3x+3-x-2
<=> 3-2x=2x+1
<=>-4x=-2
<=> x=1/2
bài 3giải các phương trình sau
b,\(\dfrac{2x}{3}=8\)
d,\(\dfrac{6}{5}x=-9\)
f,\(\dfrac{2-3x}{4}=\dfrac{4x-5}{5}\)
h,\(\dfrac{10-3x}{2}=\dfrac{6x+1}{3}\)
Giải phương trình về dạng ax+b=0
1. (- (x - 3))/2 - 2 = 5(x + 2)/4
2. 2(2x + 1)/5 - (6 + x)/3 = (5 - 4x)/15
3. (7 - 3x)/2 - (5 + x)/5 = 1
4. (x - 1)/2 +3(x + 1)/8 = (11 - 5x)/3
5. (3 + 5x)/5 - 3 = (9x - 3)/4
Bài 1 : Giải các phương trình sau :
1) (x – 2)(x – 5) = (x – 3)(x – 4)
2) ( 6x + 2)(x – 2) = 2x(3x – 5)
3) (x – 2) 2 = (x – 3)(x + 2)
4) (x–1)(x +3) – (x+2)(x–3) = 0
5) (x–2)(x –5) – (x–3)(x–4) = 0
6) (3x – 2)(4x + 3) = 2x(6x – 1)
7) 4x 2 – (2x + 1)(2x – 1) = 0
8) (4x–5)(x+3) = (2x – 3)(7+2x)
9) (x + 3)(x – 2) = (x + 1) 2
10) (x+7)(x–7) + x 2 – 2 = 2(x 2 +5)
11) (x–1) 2 + (x+3) 2 = 2(x– 2)(x+2)
12) (x – 5) 2 = (x + 3) 2 + 2
13) (3x + 2) 2 – (3x – 2) 2 = 5x + 38
1) Phương trình dạng ax+b=0
1) 2x+x+12=0
2) x-5=3-x
3)2x-(3-5x)=4(x+3)
4)2x+3/3=5-4x/2
5) x-3/5=6- 1-2x/3
6) 3x-2/6 -5=3-2(x+7)/4
7) 3x-7/2+ x+1/3= -16
8) x- x+1/3=2x+1/5
Giải phương trình
1) 2x+1=15-5x
2) 3x-2=2x+5
3) 7 (x-2)=5 (3x+1)
4) 2x+5=20-3x
5) -4x +8=0
6) x-3=10-5x
7) 3x-1=x+3
8) 2(x+1)=5x-7
bài 4 giải các phương trình sau
b,\(\dfrac{x+2}{3}-\dfrac{3}{4}=\dfrac{x-1}{3}\)
d,\(\dfrac{x-2}{4}+\dfrac{x+1}{6}=\dfrac{2x}{3}\)
f,\(\dfrac{x+2}{4}+\dfrac{2x-3}{3}=\dfrac{x-12}{6}\)
h,\(\dfrac{10x+3}{12}=1+\dfrac{6+8x}{9}\)
j,\(\dfrac{2x-1}{5}-\dfrac{x-2}{3}=\dfrac{x+7}{15}\)
m,\(\dfrac{2+x}{5}-0,5x=\dfrac{1-2x}{4}+0,25\)
Giải các phương trình sau :
a) \(\dfrac{5\left(x-1\right)+2}{6}-\dfrac{7x-1}{4}=\dfrac{2\left(2x+1\right)}{7}-5\)
b) \(\dfrac{3\left(x-3\right)}{4}+\dfrac{4x-10,5}{10}=\dfrac{3\left(x+1\right)}{5}+6\)
c) \(\dfrac{2\left(3x+1\right)+1}{4}-5=\dfrac{2\left(3x-1\right)}{5}-\dfrac{3x+2}{10}\)
d) \(\dfrac{x+1}{3}+\dfrac{3\left(2x+1\right)}{4}=\dfrac{2x+3\left(x+1\right)}{6}+\dfrac{7+12x}{12}\)
14, giải các PT sau.
1, 4-(x-5)=5(x-3x)
2, 32-4(0,5y-5)=3y+2
3, 19-2(x+11)=5(2x-3)-4(5x-7)
4, 4(x+3)-7x+17=8(5x-1)+166
5, 17-14(x+1)=13-4(x+1)-5(x-3)
6, 5(x+10)2+2x=5x2-3
7, (2x-1)2+5=(2x+3)(2x-3)-x
8, 3(x-2)2+2(x+3)(x-3)=5(x+1)2
Bài 3: Giải các phương trình sau bằng cách đưa về dạng ax +b =0
a)7 – x = -2x +3
b) 2 (3x +1) = -2x +5
c) 5x + 2(x – 1) = 4x + 7.
d) 10x^2 - 5x(2x + 3) = 15
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