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10(17 - x) - 64 = 36
<=> 10(17 - x) = 100
<=> 17 - x = 10
<=> x = 7
@Van Dong Pham
\(10\left(17-x\right)-64=36\)
\(10\left(17-x\right)=36+64\)
\(10\left(17-x\right)=100\)
\(17-x=100:10\)
\(17-x=10\)
\(x=17-10\)
\(x=7\left(tm\right)\)
Vậy ...............
\(10.\left(17-x\right)-64=36\)
\(\Leftrightarrow10.\left(17-x\right)=36+64\)
\(\Leftrightarrow10.\left(17-x\right)=100\)
\(\Leftrightarrow17-x=100:10\)
\(\Leftrightarrow17-x=10\)
\(\Leftrightarrow x=17-10\)
\(\Leftrightarrow x=7\)
chúc bạn học tốt , tick cho mk nhé
\(10.\left(17-x\right)-64=36\)
\(\Leftrightarrow10.\left(17-x\right)=36+64\)
\(\Leftrightarrow10.\left(17-x\right)=100\)
\(\Leftrightarrow17-x=100:10\)
\(\Leftrightarrow17-x=10\)
\(\Leftrightarrow x=17-10\)
\(\Leftrightarrow x=7\)
Câu 3:
a) \(\dfrac{12}{36}=\dfrac{12:12}{36:12}=\dfrac{1}{3}\)
\(\dfrac{-16}{20}=\dfrac{-16:4}{20:4}=\dfrac{-4}{5}\)
b) \(\dfrac{21}{105}=\dfrac{21:21}{105:21}=\dfrac{1}{5}\)
\(\dfrac{35}{150}=\dfrac{35:5}{150:5}=\dfrac{7}{30}\)
Câu 4:
a) \(\dfrac{3}{10}+\dfrac{5}{10}=\dfrac{3+5}{10}=\dfrac{8}{10}=\dfrac{4}{5}\)
b) Ta có: \(\left(-27\right)\cdot36+64\cdot\left(-27\right)+23\cdot\left(-100\right)\)
\(=\left(-27\right)\cdot\left(64+36\right)+23\cdot\left(-100\right)\)
\(=-27\cdot100-23\cdot100\)
\(=100\left(-27-23\right)\)
\(=-50\cdot100=-5000\)
c) \(\dfrac{5}{8}+\dfrac{3}{12}=\dfrac{15}{24}+\dfrac{6}{24}=\dfrac{21}{24}=\dfrac{7}{8}\)
d) Ta có: \(\dfrac{-2}{17}+\dfrac{3}{19}+\dfrac{-15}{17}+\dfrac{16}{19}+\dfrac{5}{6}\)
\(=\left(-\dfrac{2}{17}+\dfrac{-15}{17}\right)+\left(\dfrac{3}{19}+\dfrac{16}{19}\right)+\dfrac{5}{6}\)
\(=-1+1+\dfrac{5}{6}\)
\(=\dfrac{5}{6}\)
a,,83+17x=100
\(\Rightarrow\)17x=100-83
\(\Rightarrow17x=17\)
\(\Rightarrow\)x=1
Vậy x=1
b,100-64:(x-1)=36
\(\Rightarrow\)64:(x-1)=100-36
\(\Rightarrow\)64:(x-1)=64
\(\Rightarrow\)x-1=1
\(\Rightarrow\)x=2
Vậy x=2
Ta có: \(36.17+36.54+64.71\)
\(=36.\left(17+54\right)+64.71\)
\(=36.71+64.71\)
\(=71.\left(36+64\right)\)
\(=71.100=7100\)
\(=36.\left(17+54\right)+64.71\)
\(=36.71+64.71\)
\(=\left(36+64\right).71\)
\(=100.71\)
\(=7100\)
\(k\) \(mk\) \(nha\)
17 . 64 + 36 . 17 = ?
= 17 . ( 64 + 36 )
= 17 . 100
= 1700
Chúc bạn học tốt !
a) (x.7 + 8) : 5 = 10
x.7 + 8 = 10.5
x.7 + 8 = 50
x.7 = 50 - 8
x.7 = 42
x = 42 : 7
x = 6
b) (x + 5).19 : 13 = 57
(x + 5).19 = 57 . 13
(x + 5).19 = 741
x + 5 = 741 : 19
x + 5 = 39
x = 39 - 5
x = 34
c) 4.(36 - 4.x) = 64
36 - 4x = 64 : 4
36 - 4x = 16
4x = 36 - 16
4x = 20
x = 20 : 4
x = 5
d) 7,6 : 19 . x = 3,2
0,4 . x = 3,2
x = 3,2 : 0,4
x = 8
e) (x : 2 + 50) : 5 = 12
x : 2 + 50 = 12 . 5
x : 2 + 50 = 60
x : 2 = 60 - 50
x : 2 = 10
x = 10 . 2
x = 20
g) 280 : (17 + 3.x) = 4
17 + 3x = 280 : 4
17 + 3x = 70
3x = 70 - 17
3x = 53
x = 53/3
h) 6.(28 - 8.x) = 72
28 - 8x = 72 : 6
28 - 8x = 12
8x = 28 - 12
8x = 16
x = 16 : 8
x = 2
i) (x - 15) : 3 : 12 = 6
(x - 15) : 3 = 6 . 12
(x - 15) : 3 = 72
x - 15 = 72 . 3
x - 15 = 216
x = 216 + 15
x = 231
a)16. x2 = 64
x2 = 64 : 16
x2 = 4
x2 = 22
⇒ x = 2
b) (5.x - 2) - 64 = -36
(5.x - 2) = -36 + 64
5.x - 2 = 28
5.x = 28 + 2
5.x = 30
x = 30 : 5
x = 6
c) (2x - 10).(5 - x) = 0
TH1: 2x - 10 = 0
2x = 0 + 10
2x = 10
x = 10 : 2
x = 5
TH2: 5 - x = 0
x = 5 - 0
x = 5
⇒ Vậy x = 5.
10.(17 - x) - 64 = 36
<=> 10.(17 - x) = 100
<=> 17 - x = 10
<=> x = 7
@Van Dong Pham
\(10\left(17-x\right)-64=36\)
\(10\left(17-x\right)=36+64\)
\(10\left(17-x\right)=100\)
\(17-x=100:10\)
\(17-x=10\)
\(x=17-10\)
\(x=7\left(tm\right)\)
Vậy ...............