1. (2020五上·兴化期末) 直接写出得数

0.21÷0.3=       6+3.4=        0.82-0.42=      0.046×100=

0.9-0.09=        0.77+0.3=      80+1000=      4n+5n-8n=

0.84÷2.8=       0.16×5=        0.3²=           0.5×3÷0.5×3=