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12² + [ 2⁴³ ÷ ( 2⁹ )⁷ + 5⁶⁰ ÷ ( 5 · 5³ )¹⁵ ]=

Răspuns :

12²+[(2^4)3÷(2^9)^7+5^60÷(5^4)^15]=
=144+(2^12÷2^63+5^60÷5^60)=
=144+2^-51+5^0=144+2^-20+1=145+2^-51