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20)Calculati

a)=[a⁵x a⁷+(a¹)²⁰]⁰/[(a²)⁴/(a⁴)²]

b=[(2³)⁵+25³-7³⁵/7²⁰]/(2¹⁵-7¹⁵+5⁶)x3³⁶

c=[2+2²x2²²+2²⁰⁰/2¹²⁰+(3³)¹⁰]/[1+2²⁴+2⁸⁰+2²⁰¹³+3³⁰]-2+(5⁷)³