Question

1) (1×10^5)×(2,7×10^4);
2) (8,2×10^12)÷(2,5×10^7);
3) (5,2×10^-4)×(3,4×10^-3);
4) (4,5×10^-5)÷(9×10^-5);

Answer 1

$1) : : : (1 times {10}^{5} ) times (2.7 times {10}^{4} ) = 2.7 times {10}^{9} \ 2) : : : (8.2 times {10}^{12} ) div (2.5 times {10}^{7} ) = frac{8.2 times {10}^{12} }{2.5 times {10}^{7} } = frac{82}{25} times {10}^{5} = 3 frac{7}{25} times {10}^{5} \ 3) : : : (5.2 times {10}^{ - 4} ) times (3.4 times {10}^{ - 3} ) = frac{26}{5} times frac{17}{5} times {10}^{ - 7} = frac{442}{25} times frac{1}{ {10}^{7} } = 17.68 times ( {0.1)}^{7}$
$4) : : : (4.5 times {10}^{ - 5} ) div (9 times {10}^{ - 5} ) = frac{45}{90} = frac{1}{2} = 0.5$