6m^{2}n-14mn^{2}-mn^{2}+2m^{2}n
Simplify
7a^{4}b^{-5}\cdotp2a^{2}b
(4a^{-2})^4
(10a^{4}b^{6})(3a^{5}b^{2})-7a^{9}b^{8}
(-5x^{4}y^{7})^{2}+9x^{8}y^{14}
The temperature in the core of the sun is 15,000,000 ^\circ C.
Evaluate: (7.5\times10^{-3})\times(5.6\times10^{-8})
Evaluate: (6 \times10^{-20})\div(8\times10^{70})