①
②
③
④
7×8÷7×8= 0×0.35+3.5= +=
×+×= 0.52= 6×3.14=
①12×(+)×25
②8×(+)+
③ ++++
④×21+13×
①21÷0.5÷0.6
②125×88
③2.5×32×12.5
⑤
⑥61×40%+38× +0.4
① ×
②3÷( × )
③1- ×
④ ×( )
⑤ × ×
⑥ ×[ ÷( )]