tim x
3/4x=1
4/7x=9/8-0,125
tim x ,biet
A)3/4x=1
B)4/7x=9/8-0,125
a/
3/4 . x = 1
=> x= 1: 3/4 = 4/3
b/
4/7 .x = 9/8 -0,125 = 9/8 -1/8 = 1
=> x= 1 : 4/7 = 7/4
a/ 3/4x=1
x=1:3/4
x=4/3
b/ 4/7x=9/8-0,125
4/7x=1
x=1:4/7
x=7/4
Tìm x,biết:
A) 3/4x=1
B) 4/7x = 9/8 -0,125
Lời giải:
a)
\(\frac{3}{4}x=1\)
\(x=1:\frac{3}{4}=1.\frac{4}{3}=\frac{4}{3}\)
b)
\(\frac{4}{7}x=\frac{9}{8}-0,125\)
\(\frac{4}{7}x=1\)
\(x=1:\frac{4}{7}\)
\(x=\frac{7}{4}\)
Tìm x, biết:
a) 3/4x = 1
b) 4/7x = 9/8 - 0,125
Giải chi tiết giúp minh nhé
a) 3/4x = 1
x = 1 : 3/4
x = 4/3
b) 4/7x = 9/8 - 0,125
4/7x = 1
x = 1 : 4/7
x = 7/4
a)\(\frac{3}{4}\). x =1
x=1:\(\frac{3}{4}\)
x= \(\frac{4}{3}\)
b)\(\frac{4}{7}\).x=\(\frac{9}{8}\)-0,125
\(\frac{4}{7}\).x=1,125-0,125
\(\frac{4}{7}\).x=1
x=1:\(\frac{4}{7}\)
x=\(\frac{7}{4}\)
CHÚC BẠN HỌC GIỎI
K MÌNH NHÉ
tim so tu nhien x biet:
a> x:13=41
b>1428:x=14
c>4x:17=0
d>7x-8=718
e>8(x-3)=0
Mik ko ghi đề
Câu a)x=41×13 x=533
Câu b)x=1428:14 x=102
Câu c)4x=0×17
4x=0
x=0+4
x=4Mik mỏi tay ko viết nữa sorry
Tim X;
a/ 6x.(4x-3) - 8x.(5-3x)=43
b/(1-7x).(4x-3)-(14x-9).(5-2x)=30
c/(x+1).(x+2).(x+5) - x2.(x+8)=27
tim so tu nhien x biet
a) x : 13 = 41
b) 1428 : x = 14
c)4x :17 = 0
d) 7x - 8 = 713
e)8(x-3) =0
g) 0: x = 0
a)x:13=41
x=41.13
x=533
Vậy x=533
b)1428:x=14
x=1428:14
x=102
Vậy x=102
c)4x:17=0
4x=0.17
x=0:4
x=0
Vậy x=0
d)7x-8=713
7x=713+8
7x=721
x=721:7
x=103
Vậy x=103
tim so tu nhien x, biet
a) x : 13 = 41
b) 1428 : x = 14
c) 4x : 17 = 0
d) 7x - 8 = 713
e) 8(x-3) = 0
g) 0 : x = 0
a, x : 13 = 41
=> x = 41 x 13
=> x = 533
b, 1428 : x = 14
=> x = 1428 : 14
=> x = 102
c, 4x : 17 = 0
=> 4x = 0 x 17
=> x = 0 : 4
=> x = 0
d, 7x - 8 = 713
=> 7x = 713 + 8
=> x = 721 :7
=> x = 103
e, 8( x - 3 ) = 0
( x - 3 ) = 8 : 0
x - 3 = 0
x = 0 + 3
x = 3
g, 0 : x = 0
=> x = 0 : 0
=> x = 0
a, x : 13 = 41
=> x = 41 x 13
=> x = 533
b, 1428 : x = 14
=> x = 1428 : 14
=> x = 102
c, 4x : 17 = 0
=> 4x = 0 x 17
=> x = 0 : 4
=> x = 0
d, 7x - 8 = 713
=> 7x = 713 + 8
=> x = 721 :7
=> x = 103
e, 8( x - 3 ) = 0
( x - 3 ) = 8 : 0
x - 3 = 0
x = 0 + 3
x = 3
g, 0 : x = 0
=> x = 0 : 0
=> x = 0
Phân tích các đa thức sau thành nhân tử.
1) a^2+ab+2b-4 2) x^3-x 3) x^2-6x+8 4) ab+b^2-3a-3b 5) x^3-4x^2-8x+8
6)9x^2+6x-8 7)x^2-y^2-4x+4 8)5x^3-10x^2+5x 9) 3x^2-8x+4 10) 4x^2-4x-3
11) x^2-7x+12 12)x^2-5x-14 13) 3x^2-7x+2 14) a.(x^2+1)-x.(a^2-1) 15) x^4+4
16) (x+2).(x+3).(x+4).(x+5)-24 17) (a+1).(a+3).(a+5).(a+7)+15
a)x^2(x-3)-4x+12 b)2a(x+y)-x+y c)6x^2-12x-7x+14 d)xy-y^2-3x+3y f)x^2y+xy^2-4x-4y g)10ax-5ay-7x+14 j)a^3-a^2+9a-9(tính nhân tử chung)
a: \(x^2\left(x-3\right)-4x+12\)
\(=x^2\left(x-3\right)-4\left(x-3\right)\)
\(=\left(x-3\right)\left(x-2\right)\left(x+2\right)\)
b: \(2a\left(x+y\right)+x+y=\left(x+y\right)\left(2a+1\right)\)
c: \(6x^2-12x-7x+14\)
\(=6x\left(x-2\right)-7\left(x-2\right)\)
\(=\left(x-2\right)\left(6x-7\right)\)