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Simplify: (i) (2.75 xx 10^(7))+(1.23 x...

Simplify:
(i) `(2.75 xx 10^(7))+(1.23 xx 10^(8))` (ii) `(1.598 xx 10^(17)) -(4.58 xx 10^(15))`
(iii) `(1.02 xx 10^(10)) xx (1.20 xx 10^(-3))` (iv) `(8.41 xx 10^(4)) divide (4.3 xx 10^(5))`

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Simplify : (1.02xx10^10) xx(1.20xx10^(-3))

Simplify : (1.598xx10^17)-(4.58xx10^15)

Simplify : (2.75xx10^7)+(1.23xx10^8)

Simplify : (8.41xx10^4) div (4.3xx10^5)

Write (a) 9.87 xx 10^(9), (b) 4.134 xx 10^(-4) and (c) 1.432 xx 10^(-9) in decimal form.