ICSE New mathematics today class 7 Ex- 4A Questions & answers| written by op malhotra,Sk gupta,Anubhuti Gangal:- Tech World
Express the following in exponential form.
1) 3/4×3/4×3/4×3/4×3/4
Ans:- (3/4)^5
2) -2/5×-2/5×-2/5×-2/5×-2/5
Ans:- (-2/5)^6
3) -10/17×-10/17×-10/17×-10/17×-10/17×-10/17×-10/17×-10/17×-10/17
Ans:-(- 10/17)^9
Express each of the following as a number of the form P by q.
1) (3/5)^2
Ans:- 9/5
2) (2/9)^3
Ans:- 8/729
3) (-2/3)^7
Ans:- (-128/2187)
4) (-5/3)^3
Ans:- (-125/27)
5) (-1/2)^8
Ans:- 1/256
Express each of these rational numbers in power notation.
1) 27/64
Ans:- 3/4^3
2) 81/121
Ans:- 9/11^2
3) -8/125
Ans:--2/5^3
4)-1/512
Ans:--1/8^3
5) -32/243
Ans:--2/3^5
Find the value of
1) 1/4^3×4/3^2
Ans:- 1/36
2) -2/5^4×-5/4^3
Ans:--1/20
3)-3/7^3×-7/9^2
Ans:--1/21
4)-6/11^2×-11^3
Ans:- -396
5) -1/6^3÷-5/18^2
Ans:- -3/50
6) -1/8^3×-1^105×8/5^2
Ans:- 1/200
7) 1/2^4÷1/3^4+-1/2^3
Ans:- 79/16
8) (-3/5^3+7/25)×5/2^3
Ans:- 1
9) (12^2-5^3)×-1^40/19
Ans:- 1
Find the reciprocal of
1) 2/5^4
Ans:- 5/2^4
2) -3/4^3
Ans:- -4/3^3
3) -2^4
Ans:--1/2^4
4) -3/7^2
Ans:--7/3^2
5) -11/4^3
Ans:- -4/11^3
6) -1/8^208
Ans:- -8^208
7) -1/10^47
Ans:- -10^47
8) -3/17^89
Ans:- -17/3^89
Find the absolute value of
1) 3/4^3
Ans:- 27/64
2) -(7/8)^2
Ans:- -49/64
3) -2/3^4
Ans:- 16/81
4) -3/2^5
Ans:- -243/32
