480是60的多少倍?
用简便方法计算(1)0.13×+×13%(2)18×25%+68×25%+14÷4.
用简便方法计算8.16+5.49+2.84+4.51 1.29+3.7+2.71+6.312.98﹣(6.37+3.98)36.9﹣10.47+3.1﹣10.53.
用简便方法计算下面各题.18.5×30 34.5﹣8.9﹣9.9﹣10.9 (8﹣0.8)×125 3.5×1.02+35×0.098.
68×34+68×67﹣68.
26×49+26.