Question

please answer correctly and step by step​

Answer 1

Step-by-step explanation:

a^m÷a^n=a^m-n so

2÷7^-×÷2÷7^-3 =2÷7^5

2÷7^-×+3=2÷7^5

-×+3=5

×=-2

Answer 2

Answer:

Important terms :-

• (a)^m . (a)^n = (a)^m + n

• (a)^m ÷ (a)^n = (a)^m - n

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Answer :-

$( { \frac{2}{7} })^{ - x} \div ({ \frac{2}{7} })^{ - 3} = ( { \frac{2}{7} })^{5}$

$({ \frac{2}{7} })^{ - x - ( - 3)} = ( { \frac{2}{7} })^{5}$

$({ \frac{2}{7} })^{ - x + 3} = ( { \frac{2}{7} })^{5}$

$- x + 3 = 5$

$- x = 5 - 3$

$x = - 2 \: \: \: ans.$