Find- 30-15-8-6-8-7-14-7

Find.30 [15 {8 (6 8 7)}]+14÷70ex0ex=30 [15 {8 (6 15)}]+14÷70ex0ex=30 [15 {8 ( 9)}]+14÷70ex0ex=30 [15 17]+14÷70ex0ex=30 [ 2]+14÷70ex0ex=30+2+14÷70ex0ex=30+2+20ex ...

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Standard XII

Mathematics

Invertible Element Binary Operation

Find. 30-[15-...

Question

Find. $30 - [15 - \{8 - (6 - 8 - 7)\}] + 14 \div 7$

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Solution

Find.
$30 - [15 - \{8 - (6 - 8 - 7)\}] + 14 \div 7 = 30 - [15 - \{8 - (6 - 15)\}] + 14 \div 7 = 30 - [15 - \{8 - (- 9)\}] + 14 \div 7 = 30 - [15 - 17] + 14 \div 7 = 30 - [- 2] + 14 \div 7 = 30 + 2 + 14 \div 7 = 30 + 2 + 2 = 34$
$∴$ $30 - [15 - \{8 - (6 - 8 - 7)\}] + 14 \div 7 = 34$

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Q. Simplify:
(i) (−9) × 6 + (−9) × 4
(ii) 8 × (−12) + 7 × (−12)
(iii) 30 × (−22) + 30 × (14)
(iv) (−15) × (−14) + (−15) × (−6)
(v) 43 × (−33) + 43 × (−17)
(vi) (−36) × (72) + (−36) × 28
(vii) (−27) × (−16) + (−27) × (−14)

Find the value of :

$1 - 2 + 3 - 4 + 5 - 6 + 7 - 8 + 9 - 10 + 11 - 12 + 13 - 14 + 15$

Find the missing frequency p for the following frequency distribution whose mean is $28.25$ .

Complete the table and find the solution to the equation $m - 7 = 3$ .

$m$	$5$	$6$	$7$	$8$	$9$	$10$	$11$	$12$	$13$	$14$	$15$
$m - 7$

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Find. 30-[15-8-(6-8-7)]+14÷7

Find.30-[15-8-(6-8-7)]+14÷7=30-[15-8-(6-15)]+14÷7=30-[15-8-(-9)]+14÷7=30-15-17+14÷7=30--2+14÷7=30+2+14÷7=30+2+2=34∴30-[15-8-(6-8-7)]+14÷7=34

Find. $30 - [15 - \{8 - (6 - 8 - 7)\}] + 14 \div 7$

Find.
$30 - [15 - \{8 - (6 - 8 - 7)\}] + 14 \div 7 = 30 - [15 - \{8 - (6 - 15)\}] + 14 \div 7 = 30 - [15 - \{8 - (- 9)\}] + 14 \div 7 = 30 - [15 - 17] + 14 \div 7 = 30 - [- 2] + 14 \div 7 = 30 + 2 + 14 \div 7 = 30 + 2 + 2 = 34$
$∴$ $30 - [15 - \{8 - (6 - 8 - 7)\}] + 14 \div 7 = 34$