NCERT Solutions Class 8th Maths Chapter – 2 एक चर वाले रैखिक समीकरण (Linear Equations in One Variable)
Textbook | NCERT |
Class | 8th |
Subject | गणित (Mathematics) |
Chapter | 2nd |
Chapter Name | एक चर वाले रैखिक समीकरण (Linear Equations in One Variable) |
Category | Class 8th गणित |
Medium | Hindi |
Source | Last Doubt |
NCERT Solutions Class 8th Maths Chapter – 2 एक चर वाले रैखिक समीकरण (Linear Equations in One Variable) प्रश्नावली 2.2 in Hindi दो चरो वाले रैखिक समीकरण कौन सा है?, एक चर वाला रैखिक समीकरण कौन सा है?, दो चर वाले रैखिक समीकरण का आलेख क्या होता है?, दो चार वाले रैखिक समीकरण युग्म क्या है?, दो चर वाले रैखिक समीकरण के कितने होते हैं?, एक चर वाले रैखिक समीकरण के उदाहरण, कक्षा 8 गणित अध्याय 2 अभ्यास 2.2 समाधान और कक्षा 8 गणित अध्याय 2 अभ्यास 2.2 आदि के बारे में पढ़ेंगे।
NCERT Solutions Class 8th Maths Chapter – 2 एक चर वाले रैखिक समीकरण (Linear Equations in One Variable)
Chapter – 2
एक चर वाले रैखिक समीकरण
प्रश्नावली 2.2
निम्न रैखिक समीकरणों को हल कीजिए:
(1) x/2 – 1/5 = x/3 + 1/4
हल: 3x – 2x/6 = 5 + 4/20
x/6 = 9/20
x = 9 × 6/20
x = 54/20
x = 27/10
(2) n/2 – 3n/4 + 5n/6 = 21
हल: 6n – 9n + 10n/12
= 6n – 9n + 10n = 12
6n – 9n + 10n = 21 × 12
16n – 9n = 252
7n = 252
n = 252/7
n = 36
(3) x + 7 – 8x/3 = 17/6 – 5x/2
हल: x/1 + 7/1 – 8x/3 = 17/6 5x/2
3x + 21 – 8x/3 = 17 – 15x/6
-5x + 21/3 = 17 – 15x/6
= 6(-5x + 21)/3 = 17 – 15x
2(-5x + 21) = 17 – 15x
-10x + 42 = 17 – 15x
-10x + 15x = 17 – 42
= 5x = -25
x = 25/5
x = -5
(4) x – 5/3 = x – 3/5
हल: x – 5/3 = x – 3/5 (क्रॉस गुणा विधि)
= x – 5/3 = 3 (x – 3)
5 (x – 5) = 3x – 9
5x – 25 = 3x – 9
5x – 3x = -9 + 25
2x = 16
x = 16/2
x = 8
(5) 3t – 2/4 – 2t + 3/3 = 2/3 – t
हल: 3t – 2/4 – 2t + 3/3 = 2/3 – t
3 (3t – 2) – 4 (2t + 3)/12 = 2 – 3t/3
9t – 6 – 8t – 12/12 = 2 – 3t/3
t – 18 = 12 (2 – 3t)/3
t – 18 = (2 – 3t)
t – 18 = 8 – 12t
t + 12t = 8 + 18
12t = 26
t = 2
(6) m – m – 1/2 = 1 – m – 2/3
हल: m – m – 1/2 = 1 – m – 2/3
2m – (m – 1)/2 = 3 – (m – 2)/3
2m – m + 1 = 3 – m + 2/3 (क्रॉस गुणा विधि)
m + 1/2 = 5 – m/3
3m + 3 = 10 – 2m
3m + 2m = 10 – 3
5m = 7
m = 7/5
निम्न समीकरणों को सरल रूप में बदलते हुए कीजिए:
(7) 3 (t – 3) = 5 (2t + 1)
हल: 3t – 9 = 10t + 5
3t – 10t = 5 + 9
-7t = 14
t = 14/-7
t = -2
(8) 15 (y – 4) -2 (y – 9) + 5(y + 6) = 0
हल: 15y – 60 – 2y + 18 + 5y + 30 = 0
15y – 2y + 5y – 60 + 18 + 30 = 0
18y – 12 = 0
18y = 12
y = 12/18
y = 2/3
(9) 3 (5z – 7) -2 (9z – 11) = 4(8z – 13) – 17
हल: 3 (5z – 7) – 2 (9z – 11) = 4 (8z – 13) – 17
= 15z – 21 – 18 z + 22 = 32z – 52 – 17
= -3z + 1 = 32z – 69
= 1 + 69 = 32z + 3z
70 = 35z
70/35 = z
z = 2
(10) 0.25 (4f – 3) = 0.05 (10f – 9)
हल: 1.00f – 0.75 = 0.50f – 0.45
1.00f – 0.50f = -0.45 + 0.75
0.50f = 0.30
f = 0.30/0.50
f = 3/5
Examples |
प्रश्नावली 2.1 |
प्रश्नावली 2.2 |
NCERT Solution Class 8th Maths All Chapters In Hindi |
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