0.3²=
+=
-=
-2=
1×0.7=
3-0.5=
1-=
①9.07﹣22.78÷3.4
②0.5×99+0.5
③2.6×(93÷9.3×6.2)
④6.9÷0.125×0.8
①
②
③
②()×42
③65×+65÷7
( )