12 x 12 + 43 : 8
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\(a,\left(4x-8\right)\left(12-y\right)=0\)
\(\Rightarrow\hept{\begin{cases}4x-8=0\\12-y=0\end{cases}}\)
\(\Rightarrow\hept{\begin{cases}4x=8\\y=12\end{cases}}\)
\(\Rightarrow\hept{\begin{cases}x=2\\y=12\end{cases}}\)
\(b,\left(2x-12\right)-14=86\)
\(\Rightarrow2\left(x-6\right)=86+14=100\)
\(\Rightarrow x-6=50\)
\(\Rightarrow x=50+6=56\)
\(c,\left(127-x\right)-17=43\)
\(\Rightarrow127-x=43+17=60\)
\(\Rightarrow x=127-60=67\)
\(\left(4x-8\right)\left(12-y\right)=0\)
\(\Leftrightarrow\orbr{\begin{cases}4x-8=0\\12-y=0\end{cases}\Leftrightarrow\orbr{\begin{cases}4x=8\\y=12-0\end{cases}\Leftrightarrow}\orbr{\begin{cases}x=2\\y=12\end{cases}}}\)
Vậy x = 2 hoặc y = 12
\(\left(2x-12\right)-14=86\)
\(\Leftrightarrow2x-12=100\)
\(\Leftrightarrow2x=112\)
\(\Leftrightarrow x=56\)
Vậy x = 56
\(\left(127-x\right)-17=43\)
\(\Leftrightarrow127-x=60\)
\(\Leftrightarrow x=127-60\)
\(\Leftrightarrow x=67\)
Vậy x = 67
a: =24 phút 150 giây=26 phút 30 giây
b: =5 giờ 31 phút
a, |3x - 6| + 4x + 3 = 12
|3x - 6| = 12 - 3 - 4x
|3x - 6| = 9 - 4x
TH1: 3x - 6 = 9 - 4x ⇔ 3x + 4x = 9 + 6 ⇔ 7x = 15 ⇔ x = 15/7
TH2: 3x - 6 = 4x - 9 ⇔ 3x - 4x = -9 + 6 ⇔ -x = -3 ⇔ x = 3.
b, |6x - 12| + 3x - 1 = 43
|6x - 12| = 43 + 1 - 3x
|6x - 12| = 44 - 3x
TH1: 6x - 12 = 44 - 3x ⇔ 6x + 3x = 44 + 12 ⇔ 9x = 56 ⇔ x = 6.
TH2: 6x - 12 = 3x - 44 ⇔ 6x - 3x = -44 + 12 ⇔ 3x = -32 ⇔ x = -32/3.
c, |8 - 4x| + 7x - 5 = 16 - 2x
|8 - 4x| = (16 + 5) + (-2x - 7x)
|8 - 4x| = 21 - 9x
TH1: 8 - 4x = 21 - 9x ⇔ -4x + 9x = 21 - 8 ⇔ 5x = 13 ⇔ x = 13/5
TH2: 8 - 4x = 9x - 21 ⇔ -4x - 9x = -21 - 8 ⇔ -15x = -29 ⇔ x = 29/15
a: =5/7+1/6
=30/35+7/35
=37/35
b: =5/8+3/4
=5/8+6/8
=11/8
c: =10/12+9/12
=19/12
d: =9/24+14/24
=23/24
\(x-\dfrac{12}{8\cdot11}-\dfrac{12}{11\cdot14}-\dfrac{12}{14\cdot17}-...-\dfrac{12}{32\cdot35}=\dfrac{43}{70}\) (phải là `32*35` chứ nhỉ?)
\(x-\left(\dfrac{12}{8\cdot11}+\dfrac{12}{11\cdot14}+\dfrac{12}{14\cdot17}+...+\dfrac{12}{32\cdot35}\right)=\dfrac{43}{70}\)
\(x-4\left(\dfrac{3}{8\cdot11}+\dfrac{3}{11\cdot14}+\dfrac{3}{14\cdot17}+...+\dfrac{3}{32\cdot35}\right)=\dfrac{43}{70}\)
\(x-4\left(\dfrac{1}{8}-\dfrac{1}{11}+\dfrac{1}{11}-\dfrac{1}{14}+\dfrac{1}{14}-\dfrac{1}{17}+...+\dfrac{1}{32}-\dfrac{1}{35}\right)=\dfrac{43}{70}\)
\(x-4\left(\dfrac{1}{8}-\dfrac{1}{35}\right)=\dfrac{43}{70}\\ x-4\cdot\dfrac{27}{280}=\dfrac{43}{70}\)
\(x-\dfrac{27}{70}=\dfrac{43}{70}\\ x=\dfrac{43}{70}+\dfrac{27}{70}\\ x=\dfrac{70}{70}=1\)
1) 9 . (x + 7) - 12 = 24
9 . (x + 7) = 24 + 12
9 . (x + 7) = 36
x + 7 = 36 : 9
x + 7 = 4
x = 4 - 7
x = -3
2) 12 - 3x = -30
3x = 12 - (-30)
3x = 12 + 30
3x = 42
x = 42 : 3
x = 14
3) 95 - 105 : x = 60
105 : x = 95 - 60
105 : x = 35
x = 105 : 35
x = 3
4) x + 35 = 12
x = 12 - 35
x = -23
5) (-24) - (10 - x) = 43
-24 - 10 + x = 43
-34 + x = 43
x = 43 - (-34)
x = 43 + 34
x = 77
6) 6 - (17 + x) = -16
6 - 17 - x = -16
-11 - x = -16
x = -11 - (-16)
x = -11 + 16
x = 5
7) (x - 18) - (-3) = 0
x - 18 + 3 = 0
x - 18 = 0 - 3
x - 18 = -3
x = -3 + 18
x = 15
8) 25 - (x - 6) = -1
25 - x + 6 = -1
25 - x = -1 - 6
25 - x = -7
x = 25 - (-7)
x = 25 + 7
x = 32
1)9.(x+7)-12=24
9.(x+7)=24+12
9.(x+7)=36
x+7=36:9
x+7=4
x=4-7
x=-3
2 . 53 . 27 + 6 . 9 . 87 - 3 . 18 . 40
= 2. 53 . 9 . 3 + 2. 3 .9 .87 - 3 .2 .9 .40
= 54.53+54.87-54.40
=54(53+87-40)
=54. 100=5400
12 . 25 + 29 . 25 + 59 . 25
= 25 . ( 12+29+59)
=25 . 90
=2250
43 . 37 + 93 . 43 + 57 . 61 + 69 . 57
= 43.(37+93)+57(61+69)
=43.130+57.130
=130.(43+57)
=130.100
=13 000
12 . 53 + 53 . 172 - 53
=53(12+172-1)
=53.184
=9752
35 . 54 + 35 . 58 + 65 . 75 + 65 . 45
=35(54+58)+65(75+45)
=35.112+65.120
=3920+7800
=11720
39 . 8 + 70 . 3 + 31 . 8
=8(39+31)+70.3
=8.70+70.3
=70.(8+3)
=70.11
=770
12 x 12 + 43 : 8 = 144 + 5,375
= 149,375
23.375