arithmetic
noun
adj
əˈrɪθmətɪk
noun
1
the
science
of
numbers
involving
adding,
multiplying
etc
算术;
ˌærɪθˈmetɪk◄
adj
2
involving
or
related
to
arithmetic
[术语] 算术的
the
arithmetic
mean
(=average)
算术平均值