Solve 4.2^8-2^7/32^7+2^9

$$\frac{ { 4.2 }^{ 8- { 2 }^{ 7 } } }{ 3 { 2 }^{ 7 } + { 2 }^{ 9 } }$$

Evaluate

$$\frac{752316384526264005099991383822237233803945956334136013765601092018187046051025390625}{415550087154719744346330899664751584687664741891565739326252246611841068033982418676981844466139611548536025122968809625495747007562312336646083285641866630247296}\approx 1.810410845 \cdot 10^{-78}$$

Solution Steps

Calculate 2 to the power of 7 and get 128.

$$\frac{4.2^{8-128}}{3\times 2^{7}+2^{9}}$$

Subtract 128 from 8 to get -120.

$$\frac{4.2^{-120}}{3\times 2^{7}+2^{9}}$$

Calculate 4.2 to the power of -120 and get \frac{752316384526264005099991383822237233803945956334136013765601092018187046051025390625}{463783579413749714672244307661553107910340113718265334069477953807858334859355377987702951413102245031848242324741975028455074785225795018578217952725297578401}.

$$\frac{\frac{752316384526264005099991383822237233803945956334136013765601092018187046051025390625}{463783579413749714672244307661553107910340113718265334069477953807858334859355377987702951413102245031848242324741975028455074785225795018578217952725297578401}}{3\times 2^{7}+2^{9}}$$

Calculate 2 to the power of 7 and get 128.

$$\frac{\frac{752316384526264005099991383822237233803945956334136013765601092018187046051025390625}{463783579413749714672244307661553107910340113718265334069477953807858334859355377987702951413102245031848242324741975028455074785225795018578217952725297578401}}{3\times 128+2^{9}}$$

Multiply 3 and 128 to get 384.

$$\frac{\frac{752316384526264005099991383822237233803945956334136013765601092018187046051025390625}{463783579413749714672244307661553107910340113718265334069477953807858334859355377987702951413102245031848242324741975028455074785225795018578217952725297578401}}{384+2^{9}}$$

Calculate 2 to the power of 9 and get 512.

$$\frac{\frac{752316384526264005099991383822237233803945956334136013765601092018187046051025390625}{463783579413749714672244307661553107910340113718265334069477953807858334859355377987702951413102245031848242324741975028455074785225795018578217952725297578401}}{384+512}$$

Add 384 and 512 to get 896.

$$\frac{\frac{752316384526264005099991383822237233803945956334136013765601092018187046051025390625}{463783579413749714672244307661553107910340113718265334069477953807858334859355377987702951413102245031848242324741975028455074785225795018578217952725297578401}}{896}$$

Factor

$$\frac{5 ^ {120}}{2 ^ {7} \cdot 3 ^ {120} \cdot 7 ^ {121}} = 1.8104108452422432 \times 10^{-78}$$