Question

分别求a加b，a减b，A乘b，A除以b？

Answer 1

a=0.000....125 (小数点后有1995个0)

b=0.000....8 (小数点后有1999个0)
a=1.25x10^(-1996)
b=8x10^(-2000)
(1)
a+b
=1.25x10^(-1996) +8x10^(-2000)
=1.25x10^(-1996) +0.0008x10^(-1996)
=1.2508x10^(-1996)
(2)
a-b
=1.25x10^(-1996) -8x10^(-2000)
=1.25x10^(-1996) -0.0008x10^(-1996)
=1.2492x10^(-1996)
(3)
axb
=1.25x10^(-1996) x 8x10^(-2000)
=10x10^(-2996)
=1x10^(-2995)
(4)
a÷b
=1.25x10^(-1996) ÷ [8x10^(-2000)]
=12500÷ 8
=1562.5