195的3倍减去608除以2的商,差是多少?
195×3-608÷2
=585-304
=281;
答:差是281.
---Lucy, is maths difficult to learn in a foreign school?
---I’m not sure, but no subject can be learned well __________hard work.
A.without
B.through
C.by
D.with
信用货币的形式主要有()。
A.商业票据
B.金属铸币
C.银行券
D.存款货币