যদি A=a+b+c, B=x-3-2√2 এবং C=x2[squer] -5x+1 হয় তবে,
ক. A=0 হলে, প্রমাণ কর যে, a3+b3+c3 [hold Q পাইনি তাই] =3abc
খ. B=0 প্রমাণ কর যে (√x)3-(1/√x)3=14
গ. C=0 হলে, x5+1/x5 এর মান নির্ণয় কর।
Answers
Answered by
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Step-by-step explanation:
Let their salaries be 9x and 7x.
Let their expenditure be 4y and 3y.
According to the question,
9x−4y=2000 —(1)
7x−3y=2000 —(2)
From (1)
x=92000+4y —(3)
On putting x in (2), we get
7×9(2000+4y)−3y=2000
9(14000+28y)−3y=2000
914000+28y−27y=2000
14000+y=18000
y=4000
Now, put y in (3)
x=92000+4×4000
x=92000+16000
x=918000=2000
So,
Salary of first person =9×2000=Rs. 18000
Salary of second person =7×2000=Rs. 14000
Hence, this is the answer.
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