1.68×0.65= 2.49×7.2=
0.63÷0.21= 3.14÷0.82≈ (保留两位小数)
0.68×3.75= 0.756÷0.18=
15.4×2.6≈ (得数保留到十分位) 23.7÷1.05= (得数用循环小数表示)
0.84×0.45= 41.9÷0.75≈ (精确到百分位)
687+95= 0.46+4.9=
0.5×2.4= 0.84÷0.7= 2.6× =
1.25× ×8=
96-69= 0.72+2.8= 0.125×0.8= 0.32÷0.1=
4× ÷4× = 7÷ = 1- =
403×19= -80%= ( - )×12=