2.657*10的-23次方÷1.67*10的-24次方
=1.5691*10^[(-23)-(-24)]
=1.569*10
(-1.1*10^4)(2.3*10^5)÷(-5.06*10^13)
=1.1*2.3÷5.06*10^(4+5-13)
=0.5*10^(-4)
=5*10^(-5)
[5(x+y)^2(x-y)^2]^3÷[5(x+y)^2(x-y)]^2
=125÷25(x+y)^(2*3-2*2)(x-y)^(2*3-2)
=5(x+y)^2(x-y)^4