a, 70 - 5. ( x - 3 ) = (-3)2 . 5
b, 10 + 2 . x = 47 : 45
c , 2x - 138 - 23 . 32
d, ( 3 . x - 24 ) . 73 = 2 . 74
Giải nhanh mk k cho 3 cái mk hứa luôn
1.
a) 2x + 5 = 34 : 32
b) ( 3x - 24 ) . 73 = 2.74
c) [ 3 . ( 42 - x ) + 15 = 23 . 3
d) 126 + ( 132 - x ) = 300
2.
a) 120 - ( x + 55 ) = 60
b) ( 7x - 11)3 = 25 .52 + 200
c) 2x + 2x+4 = 544
3.
a) 10 + 2x = 49 : 47
b) 70 - 5 ( x - 3 ) = 45
c) 4 + 95 : x = 143 : 142 - 23
1)
a) 2x + 5 = 3⁴ : 3²
2x + 5 = 3²
2x + 5 = 9
2x = 9 - 5
2x = 4
x = 4 : 2
x = 2
b) (3x - 24).73 = 2.74
(3x - 24).73 = 148
3x - 24 = 148/73
3x = 148/73 + 24
3x = 1900/73
x = 1900/73 : 3
x = 1900/219
c) [3.(42 - x)] + 15 = 23.3
126 - 3x + 15 = 69
141 - 3x = 69
3x = 141 - 69
3x = 72
x = 72 : 3
x = 24
d) 126 + (132 - x) = 300
132 - x = 300 - 126
132 - x = 174
x = 132 - 174
x = -42
2)
a) 120 - (x + 55) = 60
x + 55 = 120 - 60
x + 155 = 60
x = 60 - 55
x = 5
b) (7x - 11).3 = 25.52 + 200
(7x - 11).3 = 1500
7x - 11 = 1500 : 3
7x - 11 = 500
7x = 500 + 11
7x = 511
x = 511 : 7
x = 73
c) 2x + 2x + 4 = 544
4x = 544 - 4
4x = 540
x = 540 : 4
x = 135
3)
a) 10 + 2x = 49 : 47
10 + 2x = 49/47
2x = 49/47 - 10
2x = -421/47
x = -421/47 : 2
x = -421/94
b) 70 - 5(x - 3) = 45
5(x - 3) = 70 - 45
5(x - 3) = 25
x - 3 = 25 : 5
x - 3 = 5
x = 5 + 3
x = 8
c) 4 + 95 : x = 143 : 142 - 23
4 + 95 : x = -3123/142
95 : x = -3123/142 - 4
95 : x = -3691/142
x = 95 : (-3691/142)
x = -13490/3691
a 575 - (2x +70)=445
b 575-2 (x+70)=445
c x5=32
d (3x-1)3=8
e (x-2)3=27
f (2x-3)2=9
g 2x+5 =34:32
h (4x -52).73=74
a: \(575-\left(2x+70\right)=445\)
=>\(2x+70=575-445=130\)
=>\(2x=130-70=60\)
=>x=60/2=30
b: \(575-2\left(x+70\right)=445\)
=>\(2\left(x+70\right)=575-445=130\)
=>x+70=130/2=65
=>x=65-70=-5
c: \(x^5=32\)
=>\(x^5=2^5\)
=>x=2
d: \(\left(3x-1\right)^3=8\)
=>\(\left(3x-1\right)^3=2^3\)
=>3x-1=2
=>3x=3
=>\(x=\dfrac{3}{3}=1\)
e: \(\left(x-2\right)^3=27\)
=>\(\left(x-2\right)^3=3^3\)
=>x-2=3
=>x=5
f: \(\left(2x-3\right)^2=9\)
=>\(\left[{}\begin{matrix}2x-3=3\\2x-3=-3\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}2x=6\\2x=0\end{matrix}\right.\)
=>\(\left[{}\begin{matrix}x=3\\x=0\end{matrix}\right.\)
g: \(2x+5=3^4:3^2\)
=>\(2x+5=3^2\)
=>2x+5=9
=>2x=9-5=4
=>x=4/2=2
h: \(\left(4x-5^2\right)\cdot7^3=7^4\)
=>\(4x-25=\dfrac{7^4}{7^3}=7\)
=>4x=25+7=32
=>\(x=\dfrac{32}{4}=8\)
c) (7x + x – 28) :100 – 38 = 9.
d) 936 – (4x + 5x ) = 900
e) 280 + 78 : (135 – x :7) =286
f) x – 18 :3 = 16 + 16 : 23.
g) (3x – 10) : 10 = 20.
h) (3x – 24 ).73= 2.74
i) 123 – 5.( x + 4) = 38.
k) [(6x – 72) :2 – 84].28 = 5628.
m) 2x – 138 = 23.32.
n) [(10 - x).2 + 7]:3 -2 = 3.
Trình bày kết quả rõ ràng nha cảm ơn mọi người rất nhiều❤❤❤
c) (7x + x – 28) :100 – 38 = 9
<=> 8x - 28 = 4700
<=> x = 591
d) 936 – (4x + 5x ) = 900
<=> 9x = 36
<=> x = 4
Tính hợp lí
1)271-[(-43)+271-(-17)]
2)34.(15-10)-15.(34-10)
3)125.98
4)125.16.25.14
5)35.18-5.7.28
Tính tổng
1)|x|< hoặc = 3
2)|-x|<5
Tìm x
1)-16+23+x=-16
2)-45:5(-3-2x)=3
3)24:(3x-2)=-3
4)-12+3(-x+7)=-18
Mn làm cho mk cái, ai nhanh mk tick 3 nha.
a)2x-138=23.32
b)10+2x=43.42
c)(3x-24).73=2.74
d)x4=16
e)5x+12=625
f)(x4)11= x
NHANH LÊN NHA MK CẦN GẤP LẮM LUÔN ĐẤY
2x - 138 = 23 . 32
=> 2x - 138 = 72
=> 2x = 72 + 138
=> 2x = 210
=> x = 105
10 + 2x = 43 . 42
10 + 2x =1024
2x = 1024 - 10
2x = 1014
x = 507
(3x - 24) . 73 = 2.74
3x - 24 = 2 . 74 : 73
3x - 16 = 14
3x = 14 + 16
3x = 30
x = 10
x4 = 16
=> x4 = 24
=> x = 2
5x + 12 = 625
5x + 12 = 54
=> x + 12 = 4
=> x = 4 - 12
=> x = -8
(x4)11 = x
x44 = x
=> x = 1; 0
tìm x thuộc Z
( x - 3). ( 6 - x )
-2 (x-1) + (-6) = 10
-20 : 5 - 2x - 3 (-2) = 12
ko cần làm hết đâu nha
ai nhanh mk k cho 3 cái cần gấp lắm
\(-2\left(x-1\right)+\left(-6\right)=10\)
\(-2\left(x-1\right)=10-\left(-6\right)\)
\(-2\left(x-1\right)=16\)
\(x-1=16:\left(-2\right)\)
\(x-1=-8\)
\(x=-8+1\)
\(x=-7\)
\(-2\left(x-1\right)+\left(-6\right)=10\)
\(-2.\left(x-1\right)=10-\left(-6\right)\)
\(-2\left(x-1\right)=16\)
\(x-1=16:\left(-2\right)\)
\(x-1=-8\)
\(x=\left(-8\right)+1\)
\(x=-7\)
a) x + 2,5 - 1,5 = 10 x 2
b) x - 10 + 5 = 20 - 10
k mk 3 cái mk k lại 3 cái nha
a. x + 2,5 - 1,5 = 20 x+2,5 = 20 + 1,5 x+ 2,5=21,5 x= 21,5 - 2,5 x= 19 b. x - 10 + 5 = 10 x - 10 = 10 - 5 x - 10 = 5 x = 5 + 10 x = 15
a) x+2,5-1,5=10x2
x+(2,5-1,5)=20
x+1=20
x = 20-1
x = 19
b) x-(10+5)=(20-10)
x -15=10
x = 15+10
x = 25
nhớ k minh minh k lại
x + 2,5 - 1,5 = 10 x 2
x + 2,5 - 1,5 = 20
x + 2,5 = 20 + 1,5
x + 2,5 = 21,5
x = 21,5 - 2,5
x = 19
x - 10 + 5 = 20 - 10
x - 10 + 5 = 10
x - 10 = 10 - 5
x - 10 = 5
x = 5 + 10
x = 15
Phân tích thành nhân tử:
a, x3-5x2+8x-4
b,x3+8x2+17x+10
c,x4+2x3+x2+x+1
Mk đg cần gấp lắm!! Ai lm đc mk hứa sẽ k cho
a) \(x^3-5x^2+8x-4\)
\(=x^3-x^2-4x^2+4x+4x-4\)
\(=x^2\left(x-1\right)-4x\left(x-1\right)+4\left(x-1\right)\)
\(=\left(x-1\right)\left(x^2-4x+4\right)=\left(x-1\right)\left(x-2\right)^2\)
a) \(x^3-5x^2+8x-4\)
\(=x^3-x^2-4x^2+4x+4x-4\)
\(=x^2\left(x-1\right)-4x\left(x-1\right)+4\left(x-1\right)\)
\(=\left(x-1\right)\left(x^2-4x+4\right)=\left(x-1\right)\left(x-2\right)^2\)
Tick cho phamthiminhtrang trường mk 2 cái mk tick cho 3 cái , hứa đó ! Nhanh lên !
x + 600 = 500 + 500
x+600=500+500
x+600=1000
x=1000-600
x=400
Ủng hộ cho mình nhé!
Hello
x + 600 = 500 + 500
x + 600 = 1000
x = 1000 - 600
x = 400